Transition metal compound, ligand system, catalyst system and the use of the latter for polymerisation and copolymerisation of olefins

ABSTRACT

A process for the polymerization of olefins, in particular a process for the copolymerization of propylene with further olefins, is carried out in the presence of highly active catalyst systems comprising specifically selected metallocenes, in particular ones which bear different substituents in position 2 and position 4 on an indenyl ligand. Novel polypropylene copolymers can be obtained by this process.

The present invention relates to a process for the polymerization ofolefins, in particular a process for the copolymerization of propylenewith further olefins, to specifically substituted metallocenes, toligand systems and to highly active catalyst systems.

Processes for preparing polyolefins with the aid of soluble, homogeneouscatalyst systems comprising a transition metal component of themetallocene type and a cocatalyst component such as an aluminoxane, aLewis acid or an ionic compound are known. These catalysts have a highactivity and give polymers and copolymers having a narrow molar massdistribution.

In polymerization processes using soluble, homogeneous catalyst systems,heavy deposits are formed on reactor walls and stirrer if the polymer isobtained as a solid. These deposits are formed by agglomeration of thepolymer particles whenever metallocene and/or cocatalyst are present indissolved form in the suspension. Such deposits in the reactor systemshave to be removed regularly, since they quickly reach considerablethicknesses, have a high strength and prevent heat exchange with thecooling medium. Such homogeneous catalyst systems cannot be used inmodern industrial polymerization processes in liquid monomer or in thegas phase.

To avoid deposit formation in the reactor, supported catalyst systems inwhich the metallocene and/or the aluminum compound serving as cocatalystare fixed to an inorganic support material have been proposed.

Metallocenes can, if appropriate in combination with one or morecocatalysts, be used as catalyst components for the polymerization andcopolymerization of olefins. In particular, halogen-containingmetallocenes are used as catalyst precursors which can be converted, forexample, by means of an aluminoxane into a polymerization-activecationic metallocene complex (EP-A-129368).

The preparation of metallocenes is known per se (U.S. Pat. No.4,752,597; U.S. Pat. No. 5,017,714; EP-A-320762; EP-A-416815;EP-A-537686; EP-A-669340; H. H. Brintzinger et al.; Angew. Chem., 107(1995), 1255; H. H. Brintzinger et al., J. Organomet. Chem. 232 (1982),233. For this purpose, it is possible, for example, to reactcyclopentadienylmetal compounds with halides of transition metals suchas titanium, zirconium and hafnium.

EP 576 970 A1 discloses metallocenes and corresponding, supportedcatalyst systems.

The supported catalyst systems give, at industrially relevantpolymerization temperatures of 50-80° C., polymers, in particularpolypropylenes, having melting points of not more than 156° C.; typicalvalues for such systems are merely in the region around 150° C.

In the field of copolymerization, copolymers having low molar masses orlow levels of ethene incorporation are usually obtained. In this area,it would be desirable to have a high molar mass and a high degree ofethene incorporation without adverse effect on the molar mass of thecopolymer and also an increase in the molar mass of the resultingcopolymer compared to the molar mass of the homopolymer.

EP-A-659757, Spaleck et al., J. Mol. Catal. A: Chemical 1998, 128,279-287 and EP-A-834519 describe metallocene compounds containing twodifferently substituted indenyl ligands. It is found that themetallocene compounds described there give very low molecular weightcopolymers in the copolymerization of, for example, ethylene andpropylene. In addition, the ethene content of the copolymer is low. Thesystems described there additionally suffer from a considerable decreasein molar mass compared to the corresponding homopolymer. Theincorporation of ethene appears to lead to a greater number oftermination reactions. In addition to this observation, thepolymerization activity in a heterogeneous polymerization is lowcompared to that in a homogeneneous polymerization. This leads torestricted commercial utilization.

For many polymer applications, for example in the fields of extrusionand injection molding, such products are not yet satisfactory in termsof hardness or mechanical strength. In the preparation of copolymers,these metallocenes and catalyst systems generally produce copolymerswhose achievable molar masses decrease steadily with increasingcomonomer content. Particularly in the area of block copolymerproduction or reactor blend production, this behavior is a disadvantage,since a high molar mass is wanted to achieve a high hardness/impacttoughness of the desired copolymer or terpolymer fraction.

It is an object of the present invention to find supported metallocenecatalysts which avoid the disadvantages of the prior art and, inparticular, give copolymers having a high molar mass and a high degreeof ethene incorporation under industrially relevant polymerizationconditions as a result of their high regiospecificity andstereospecificity. In addition, these metallocenes should display asignificantly increased polymerization activity in a heterogeneouspolymerization and provide an environmentally friendly and economicalprocess for preparing the polymers.

We have found that this object is achieved by a process for thepolymerization of olefins, in particular for the coolymerization ofpropylene with at least one further olefin, in which the polymerizationis carried out in the presence of a catalyst system comprising at leastone specifically substituted metallocene, at least one cocatalyst, ifdesired a passivated support and, if desired, at least one furtheradditive component.

The metallocene used in the process of the present invention is acompound of the formula (I)

where

-   M¹¹-   is a metal of group IVb of the Periodic Table of the Elements,-   R³¹, R³²-   are identical or different and are each a hydrogen atom, a    C₁-C₁₀-alkyl group, a C₁-C₁₀-alkoxy group, a C₆-C₂₀-aryl group, a    C₆-C₁₀-aryloxy group, a C₂-C₁₀-alkenyl group, an OH group, an    N(R^(32a))₂ group, where R^(32a) is a C₁-C₁₀-alkyl group or a    C₆-C₁₄-aryl group, or a halogen atom, where R³¹ and R³² can also be    joined to form a ring,-   R³⁴, R³⁶, R³⁷ and R³⁸ and also R^(34′), R^(36′), R^(37′) and R^(38′)-   are identical or different and are each a hydrogen atom or a    hydrocarbon group which may be halogenated, linear, cyclic or    ranched, e.g. a C₁-C₁₀-alkyl group, a C₂-C₁₀-alkenyl group, a    C₆-C₂₀-aryl group, a C₇-C₄₀-arylalkyl group, a C₇-C₄₀-alkylaryl    group or a C₈-C₄₀-arylalkenyl group,-   R³³ and R^(33′)-   are identical or different, where-   R³³-   is as defined for R^(33′) or is a hydrocarbon group which is    unbranched in the α position and may be halogenated, e.g. a    C₁-C₂₀-alkyl group, a C₂-C₂₀-alkenyl group, a C₇-C₄₀-alkylaryl group    or a C₈-C₄₀-alkenylaryl group,-   R^(33′)-   is a hydrocarbon group which is cyclized in the α position or    branched in the a position and may be halogenated, e.g. a    C₃-C₂₀-alkyl group, a C₃-C₂₀-alkenyl group, a C₆-C₂₀-aryl group, a    C₇-C₄₀-arylalkyl group, a C₇-C₄₀-alkylaryl group or a    C₈-C₄₀-arylalkenyl group,-   R³⁵, R^(35′)-   are identical or different and are each a C₆-C₂₀-aryl group which in    the para position relative to the point of linkage to the indenyl    ring bears a substituent R⁴³ or R^(43′),

-   R³⁵ and R^(35′) may not be the combinations of phenyl and 1-naphthyl    or 1-naphthyl and phenyl when R³³ is methyl or ethyl and R^(33′) is    isopropyl,-   R³⁹-   is a bridge:

-   R⁴⁰, R⁴¹-   can be identical or different, even when they have the same index,    and are each a hydrogen atom, a halogen atom or a C₁-C₄₀ group such    as a C₁-C₂₀-alkyl group, a C₁-C₁₀-fluoroalkyl group, a C₁-C₁₀-alkoxy    group, a C₆-C₁₄-aryl group, a C₆-C₁₀-fluoroaryl group, a    C₆-C₁₀-aryloxy group, a C₂-C₁₀-alkenyl group, a C₇-C₄₀-arylalkyl    group, a C₇-C₄₀-alkylaryl group or a C₈-C₄₀-arylalkenyl group, where    R⁴⁰ and R⁴¹ may each, together with the atoms connecting them, form    one or more rings, and x is an integer from zero to 18,-   M¹²-   is silicon, germanium or tin,-   R³⁹-   may also link two units of the formula I with one another,-   R⁴³-   can be a hydrogen atom if R³⁵ is different from R^(35′), or a    C₁-C₁₀-alkyl radical, a C₂-C₁₀-alkenyl radical, a C₆-C₁₈-aryl    radical, a C₇-C₂₀-arylalkyl radical, a C₇-C₂₀-alkylaryl radical, a    C₈-C₂₀-arylalkenyl radical, where the hydrocarbon radicals may also    be halogenated or partially halogenated by fluorine or chlorine, and    be —N(R⁴⁴)₂, —P(R⁴⁴)₂, —SR⁴⁴, —Si(R⁴⁴)₃, —[N(R⁴⁴)₃]⁺ or —[P(R⁴⁴)₃]⁺,    where the radicals R⁴⁴ are identical or different and are each a    hydrogen atom or a hydrocarbon group which may be halogenated,    linear, cyclic or branched, e.g. a C₁-C₁₀-alkyl group, a    C₂-C₁₀-alkenyl group, a C₆-C₂₀-aryl group, a C₁-C₄₀-arylalkyl group,    a C₇-C₄₀-alkylaryl group or a C₈-C₄₀-arylalkenyl group,-   R^(43′)-   is hydrogen or is as defined for R⁴³,-   R⁴⁵, R^(45′), R⁴⁶ and R^(46′)-   are each hydrogen or C₄-C₂₀-aryl, alkenyl or alkyl ring systems    which may also be linked to the radicals R³⁶, R^(36′) or R³⁴,    R^(34′).

The 4,5,6,7-tetrahydroindenyl analogs corresponding to the compounds Iare likewise of importance.

In formula (I), it is preferred that

-   M¹¹-   is zirconium or hafnium,-   R³¹ and R³²-   are identical or different and are each a C₁-C₁₀-alkyl group, a    C₁-C₁₀-alkoxy group, a C₆-C₁₀-aryloxy group or a halogen atom, where    R³¹ and R³² may also be joined to form a ring,-   R³³, R^(33′)-   are different,-   R³³-   is a linear C₁-C₁₀-alkyl group or a linear C₂-C₁₀-alkenyl group,-   R^(33′)-   is a hydrocarbon group which is cyclized in the α position or    branched in the α position and in which the atom in the α position    is bound to a total of three carbon atoms, e g. a C₃-C₁₀-alkyl    group, a C₃-C₁₀-alkenyl group, a C₆-C₁₄-aryl group, a    C₇-C₁₅-arylalkyl group, a C₇-C₁₅-alkylaryl group or a    C₈-C₁₆-arylalkenyl group,-   R³⁴, R³⁶, R³⁷ and R³⁸ and also R^(34′), R^(36′), R^(37′) and R^(38′)-   are identical or different and are each a hydrogen atom or a    C₁-C₁₀-alkyl group which may be halogenated, linear, cyclic or    branched,-   R³⁹-   is R⁴⁰R⁴¹Si═, R⁴⁰R⁴¹Ge═, R⁴⁰R⁴¹C═ or —(R⁴⁰R⁴¹C—CR⁴⁰R⁴¹)—, where R⁴⁰    and R⁴¹ are identical or different and are each hydrogen or a    C₁-C₂₀-hydrocarbon group, in particular C₁-C₁₀-alkyl or C₆-C₁₄-aryl,-   R³⁵, R^(35′)-   are identical or different and are each a C₆-C₂₀-aryl group which in    the para position relative to the point of linkage to the indenyl    ring bears a substituent R⁴³ or R^(43′),

-   R⁴³-   is a C₁-C₁₀-alkyl radical, a C₂-C₁₀-alkenyl radical, a C₆-C₁₈-aryl    radical, a C₇-C₂₀-arylalkyl radical, a C₇-C₂₀-alkylaryl radical, a    C₈-C₂₀-arylalkenyl radical, where the hydrocarbon radicals may also    be halogenated or partially halogenated by fluorine or chlorine,    —N(R⁴⁴)₂, —P(R⁴⁴)₂, —SR⁴⁴, —Si(R⁴⁴)₃, —N(R⁴⁴)³⁺ or —P(R⁴⁴)³⁺, where    the radicals R⁴⁴ are identical or different and are each a hydrogen    atom or a hydrocarbon group which may be halogenated, linear, cyclic    or branched, e.g. a C₁-C₁₀-alkyl group, a C₂-C₁₀-alkenyl group, a    C₆-C₂₀-aryl group, a C₇-C₄₀-arylalkyl group, a C₇-C₄₀-alkylaryl    group or a C₈-C₄₀-arylalkenyl group,-   R^(43′)-   is as defined for R⁴³ or is hydrogen,-   R⁴⁵, R^(45′), R⁴⁶ and R^(46′)-   are each hydrogen or a C₄-C₈-aryl ring system.

In formula I, it is very particularly preferred that

-   M¹¹-   is zirconium,-   R³¹, R³²-   are identical and are each chlorine, methyl or phenoxide,-   R³³, R^(33′)-   are different,-   R³³-   is methyl, ethyl, n-propyl or n-butyl,-   R^(33′)-   is a hydrocarbon group which is cyclized in the α position or    branched in the α position and in which the atom in the α position    is bound to a total of three carbon atoms, e.g. a C₃-C₁₀-alkyl group    or a C₃-C₁₀-alkenyl group,-   R³⁹-   is R⁴⁰R⁴¹Si═, R⁴⁰R⁴¹C═ or —(R⁴⁰R⁴¹C—CR⁴⁰R⁴¹)—, where R⁴⁰ and R⁴¹ are    identical or different and are each phenyl or methyl,-   R³⁴, R³⁶, R³⁷ and R³⁸ and also R^(34′), R^(36′), R^(37′) and R^(38′)    are each hydrogen,-   R³⁵, R^(35′)-   are identical or different and are each a C₆-C₂₀-aryl group, in    particular a phenyl or 1-naphthyl group which bears a substituent    R⁴³ or R^(43′) in the para position relative to the point of linkage    to the indenyl ring, where R⁴³ or R^(43′) is a branched C₃-C₁₀-alkyl    radical, a branched C₃-C₁₀-alkenyl radical, a branched    C₇-C₂₀-alkylaryl radical or an Si(R⁴⁴)₃ radical where R⁴⁴ is    particularly preferably as defined for R³³, where the hydrocarbon    radicals may also be halogenated or partially halogenated by    fluorine or chlorine.

Examples of preferred metallocene components of the catalyst system ofthe present invention are combinations of the following molecularfragments of the compound I:

-   M¹¹R³¹R³²:-   ZrCl₂, Zr(CH₃)₂, Zr(O—C₆H₅)₂-   R³³:-   methyl, ethyl, n-propyl, n-butyl,-   R^(33′):-   isopropyl, sec-butyl, cyclobutyl, 1-methylbutyl, 1-ethylbutyl,    1-methylpentyl, cyclopentyl, cyclohexyl, cyclopent-2-enyl,    cyclopent-3-enyl, cyclohex-2-enyl, cyclohex-3-enyl,    para-methylcyclohexyl,-   R³⁴, R³⁶, R³⁷ and R³⁸ and also R^(34′), R^(36′), R^(37′) and    R^(38′):-   hydrogen,-   R³⁵, R^(35′):-   p-isopropylphenyl, p-tert-butylphenyl, p-s-butylphenyl,    p-cyclohexylphenyl, p-trimethylsilylphenyl, p-adamantylphenyl,    p-(trisfluoro)trimethylphenyl,-   R³⁹:-   dimethylsilanediyl, dimethylgermanediyl, ethylidene,    1-methylethylidene, 1,1-dimethylethylidene, 1,2-dimethylethylidene,    1,1,2,2-tetramethylethylidene, dimethylmethylidene,    phenylmethylmethylidene, diphenylmethylidene.

Specific examples of preferred metallocene components of the catalystsystem of the present invention are thus the following compounds I:

2-isopropyl, 2-methyl, symmetrically substituted in the 4 positions:

-   dimethylsilanediyl(2-isopropyl-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-isopropylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-tert-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-sec-butylphenyl)indenyl)(2-methyl-4-(p-sec-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-cyclohexylphenyl)indenyl)(2-methyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-trimethylsilylphenyl)-indenyl)(2-methyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-adamantylphenyl)indenyl)(2-methyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)(2-methyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-sec-butyl, 2-methyl, symmetrically substituted in the 4 positions:

-   dimethylsilanediyl(2-sec-butyl-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-isopropylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-tert-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-sec-butylphenyl)indenyl)(2-methyl-4-(p-sec-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-cyclohexylphenyl)indenyl)(2-methyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-trimethylsilylphenyl)indenyl)(2-methyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-adamantylphenyl)indenyl)(2-methyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)(2-methyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-(1-methylbutyl), 2-methyl, symmetrically substituted in the 4positions:

-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-isopropylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-tert-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-sec-butylphenyl)indenyl)(2-methyl-4-(p-sec-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-cyclohexylphenyl)indenyl)(2-methyl-4-(p-(1-methylbutyl)phenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-trimethylsilylphenyl)indenyl)(2-methyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-adamantylphenyl)indenyl)(2-methyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)(2-methyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-cyclopentyl, 2-methyl, symmetrically substituted in the 4 positions:

-   dimethylsilanediyl(2-cyclopentyl-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-isopropylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-tert-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-sec-butylphenyl)indenyl)(2-methyl-4-(p-sec-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-cyclohexylphenyl)indenyl)(2-methyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-trimethylsilylphenyl)indenyl)(2-methyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-adamantylphenyl)indenyl)(2-methyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)(2-methyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-cyclohexyl, 2-methyl, symmetrically substituted in the 4 positions:

-   dimethylsilanediyl(2-cyclohexyl-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-isopropylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-tert-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-sec-butylphenyl)indenyl)(2-methyl-4-(p-sec-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-cyclohexylphenyl)indenyl)(2-methyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-trimethylsilylphenyl)indenyl)(2-methyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-adamantylphenyl)indenyl)(2-methyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)(2-methyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-p-methylcyclohexyl, 2-methyl, symmetrically substituted in the 4positions:

-   dimethylsilanediyl(2-p-methylcyclohexyl-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-isopropylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-p-methylcyclohexyl-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-tert-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-p-methylcyclohexyl-4-(p-sec-butylphenyl)indenyl)(2-methyl-4-(p-sec-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-p-methylcyclohexyl-4-(p-cyclohexylphenyl)indenyl)(2-methyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-p-methylcyclohexyl-4-(p-trimethylsilylphenyl)indenyl)(2-methyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-p-methylcyclohexyl-4-(p-adamantylphenyl)indenyl)(2-methyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-p-methylcyclohexyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)(2-methyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-isopropyl, 4-(p-tert-butylphenyl), 2-methyl, various substituents inthe other 4 position:

-   dimethylsilanediyl(2-isopropyl-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-isopropylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-sec-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-sec-butyl, 4-(p-tert-butylphenyl), 2-methyl, various substituents inthe other 4 position:

-   dimethylsilanediyl(2-sec-butyl-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-isopropylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-sec-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-(1-methylbutyl), 4-(p-tert-butylphenyl), 2-methyl, varioussubstituents in the other 4 position:

-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-isopropylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-sec-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-cyclopentyl, 4-(p-tert-butylphenyl), 2-methyl, various substituents inthe other 4 position:

-   dimethylsilanediyl(2-cyclopentyl-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-isopropylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-sec-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-cyclohexyl, 4-(p-tert-butylphenyl), 2-methyl, various substituents inthe other 4 position:

-   dimethylsilanediyl(2-cyclohexyl-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-isopropylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-sec-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-(p-methylcyclohexyl), 4-(p-tert-butylphenyl), 2-methyl, varioussubstituents in the other 4 position:

-   dimethylsilanediyl(2-(p-methylcyclohexyl)-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-isopropylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(p-methylcyclohexyl)-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-sec-butylphenyl)indenyl)zirconiumdichloride,-   dimethylsilanediyl(2-(p-methylcyclohexyl)-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(p-methylcyclohexyl)-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(p-methylcyclohexyl)-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(p-methylcyclohexyl)-4-(p-tert-butylphenyl)indenyl)(2-methyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-isopropyl, 4-(p-isopropylphenyl), 2-methyl, various substituents inthe other 4 position:

-   dimethylsilanediyl(2-isopropyl-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-tert-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-sec-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-sec-butyl, 4-(p-isopropylphenyl), 2-methyl, various substituents inthe other 4 position:

-   dimethylsilanediyl(2-sec-butyl-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-tert-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-sec-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-(1-methylbutyl), 4-(p-isopropylphenyl), 2-methyl, various substituentsin the other 4 position:

-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-tert-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-isopropylphenyl)idenyl(2-methyl-4-p-sec-butylphenyl)idenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-cyclopentyl, 4-(p-isopropylphenyl), 2-methyl, various substituents inthe other 4 position:

-   dimethylsilanediyl(2-cyclopentyl-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-tert-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-sec-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-cyclohexyl, 4-(p-isopropylphenyl), 2-methyl, various substituents inthe other 4 position:

-   dimethylsilanediyl(2-cyclohexyl-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-tert-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-sec-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-(p-methylcyclohexyl), 4-(p-isopropylphenyl), 2-methyl, varioussubstituents in the other 4 position:

-   dimethylsilanediyl(2-(p-methylcyclohexyl)-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-tert-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(p-methylcyclohexyl)-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-sec-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(p-methylcyclohexyl)-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(p-methylcyclohexyl)-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(p-methylcyclohexyl)-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(p-methylcyclohexyl)-4-(p-isopropylphenyl)indenyl)(2-methyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-isopropyl, 4-(p-sec-butyl), 2-methyl, various substituents in theother 4 position:

-   dimethylsilanediyl(2-isopropyl-4-(p-sec-butyl)indenyl)(2-methyl-4-(p-tert-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-sec-butyl)indenyl)(2-methyl-4-(p-isopropylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-sec-butyl)indenyl)(2-methyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-sec-butyl)indenyl)(2-methyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-sec-butyl)indenyl)(2-methyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-sec-butyl)indenyl)(2-methyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-sec-butyl, 4-(p-sec-butyl), 2-methyl, various substituents in theother 4 position:

-   dimethylsilanediyl(2-sec-butyl-4-(p-sec-butyl)indenyl)(2-methyl-4-(p-tert-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-sec-butyl)indenyl)(2-methyl-4-(p-isopropylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-sec-butyl)indenyl)(2-methyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-sec-butyl)indenyl)(2-methyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-sec-butyl)indenyl)(2-methyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-sec-butyl)indenyl)(2-methyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-(1-methylbutyl), 4-(p-sec-butyl), 2-methyl, various substituents inthe other 4 position:

-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-sec-butyl)indenyl)(2-methyl-4-(p-tert-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-sec-butyl)indenyl)(2-methyl-4-(p-isopropylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-sec-butyl)indenyl)(2-methyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-sec-butyl)indenyl)(2-methyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-sec-butyl)indenyl)(2-methyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-sec-butyl)indenyl)(2-methyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-cyclopentyl, 4-(p-sec-butyl), 2-methyl, various substituents in theother 4 position:

-   dimethylsilanediyl(2-cyclopentyl-4-(p-sec-butyl)indenyl)(2-methyl-4-(p-tert-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-sec-butyl)indenyl)(2-methyl-4-(p-isopropylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-sec-butyl)indenyl)(2-methyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-sec-butyl)indenyl)(2-methyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-sec-butyl)indenyl)(2-methyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-sec-butyl)indenyl)(2-methyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-cyclohexyl, 4-(p-sec-butyl), 2-methyl, various substituents in theother 4 position:

-   dimethylsilanediyl(2-cyclohexyl-4-(p-sec-butyl)indenyl)(2-methyl-4-(p-tert-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-sec-butyl)indenyl)(2-methyl-4-(p-isopropylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-sec-butyl)indenyl)(2-methyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-sec-butyl)indenyl)(2-methyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-sec-butyl)indenyl)(2-methyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-sec-butyl)indenyl)(2-methyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-(p-methylcyclohexyl), 4-(p-sec-butyl), 2-methyl, various substituentsin the other 4 position:

-   dimethylsilanediyl(2-(p-methylcyclohexyl)-4-(p-sec-butyl)indenyl)(2-methyl-4-(p-tert-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(p-methylcyclohexyl)-4-(p-sec-butyl)indenyl)(2-methyl-4-(p-isopropylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(p-methylcyclohexyl)-4-(p-sec-butyl)indenyl)(2-methyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(p-methylcyclohexyl)-4-(p-sec-butyl)indenyl)(2-methyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(p-methylcyclohexyl)-4-(p-sec-butyl)indenyl)(2-methyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(p-methylcyclohexyl)-4-(p-sec-butyl)indenyl)(2-methyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-isopropyl, 2-ethyl, symmetrically substituted in the 4 positions:

-   dimethylsilanediyl(2-isopropyl-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-isopropylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-tert-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-sec-butylphenyl)indenyl)(2-ethyl-4-(p-sec-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-cyclohexylphenyl)indenyl)(2-ethyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-trimethylsilylphenyl)indenyl)(2-ethyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-adamantylphenyl)indenyl)(2-ethyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)(2-ethyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-sec-butyl, 2-ethyl, symmetrically substituted in the 4 positions:

-   dimethylsilanediyl(2-sec-butyl-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-isopropylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-tert-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-sec-butylphenyl)indenyl)(2-ethyl-4-(p-sec-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-cyclohexylphenyl)indenyl)(2-ethyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-trimethylsilylphenyl)indenyl)(2-ethyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-adamantylphenyl)indenyl)(2-ethyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)(2-ethyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-(1-methylbutyl), 2-ethyl, symmetrically substituted in the 4positions:

-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-isopropylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-tert-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-sec-butylphenyl)indenyl)(2-ethyl-4-(p-sec-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-cyclohexylphenyl)indenyl)(2-ethyl-4-(p-(1-methylbutyl)phenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-trimethylsilylphenyl)indenyl)(2-ethyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-adamantylphenyl)indenyl)(2-ethyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)(2-ethyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-cyclopentyl, 2-ethyl, symmetrically substituted in the 4 positions:

-   dimethylsilanediyl(2-cyclopentyl-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-isopropylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-tert-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-sec-butylphenyl)indenyl)(2-ethyl-4-(p-sec-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-cyclohexylphenyl)indenyl)(2-ethyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-trimethylsilylphenyl)indenyl)(2-ethyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-adamantylphenyl)indenyl)(2-ethyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)(2-ethyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-cyclohexyl, 2-ethyl, symmetrically substituted in the 4 positions:

-   dimethylsilanediyl(2-cyclohexyl-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-isopropylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-tert-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-sec-butylphenyl)indenyl)(2-ethyl-4-(p-sec-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-cyclohexylphenyl)indenyl)(2-ethyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-trimethylsilylphenyl)indenyl)(2-ethyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-adainantylphenyl)indenyl)(2-ethyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)(2-ethyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-p-methylcyclohexyl, 2-ethyl, symmetrically substituted in the 4positions:

-   dimethylsilanediyl(2-p-methylcyclohexyl-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-isopropylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-p-methylcyclohexyl-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-tert-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-p-methylcyclohexyl-4-(p-sec-butylphenyl)indenyl)(2-ethyl-4-(p-sec-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-p-methylcyclohexyl-4-(p-cyclohexylphenyl)indenyl)(2-ethyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-p-methylcyclohexyl-4-(p-trimethylsilylphenyl)indenyl)(2-ethyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-p-methylcyclohexyl-4-(p-adamantylphenyl)indenyl)(2-ethyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-p-methylcyclohexyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)(2-ethyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-isopropyl, 4-(p-tert-butylphenyl), 2-ethyl, various substituents inthe other 4 position:

-   dimethylsilanediyl(2-isopropyl-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-isopropylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-sec-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-sec-butyl, 4-(p-tert-butylphenyl), 2-ethyl, various substituents inthe other 4 position:

-   dimethylsilanediyl(2-sec-butyl-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-isopropylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-sec-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-(1-methylbutyl), 4-(p-tert-butylphenyl), 2-ethyl, various substituentsin the other 4 position:

-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-isopropylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-sec-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-cyclopentyl, 4-(p-tert-butylphenyl), 2-ethyl, various substituents inthe other 4 position:

-   dimethylsilanediyl(2-cyclopentyl-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-isopropylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-sec-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-cyclohexyl, 4-(p-tert-butylphenyl), 2-ethyl, various substituents inthe other 4 position:

-   dimethylsilanediyl(2-cyclohexyl-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-isopropylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-sec-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-(p-methylcyclohexyl), 4-(p-tert-butylphenyl), 2-ethyl, varioussubstituents in the other 4 position:

-   dimethylsilanediyl(2-(p-methylcyclohexyl)-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-isopropylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(p-methylcyclohexyl)-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-sec-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(p-methylcyclohexyl)-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(p-methylcyclohexyl)-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(p-methylcyclohexyl)-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(p-methylcyclohexyl)-4-(p-tert-butylphenyl)indenyl)(2-ethyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-isopropyl, 4-(p-isopropylphenyl), 2-ethyl, various substituents in theother 4 position:

-   dimethylsilanediyl(2-isopropyl-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-tert-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-sec-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-sec-butyl, 4-(p-isopropylphenyl), 2-ethyl, various substituents in theother 4 position:

-   dimethylsilanediyl(2-sec-butyl-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-tert-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-sec-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-(1-methylbutyl), 4-(p-isopropylphenyl), 2-ethyl, various substituentsin the other 4 position:

-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-tert-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-sec-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-cyclopentyl, 4-(p-isopropylphenyl), 2-ethyl, various substituents inthe other 4 position:

-   dimethylsilanediyl(2-cyclopentyl-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-tert-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-sec-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-cyclohexyl, 4-(p-isopropylphenyl), 2-ethyl, various substituents inthe other 4 position:

-   dimethylsilanediyl(2-cyclohexyl-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-tert-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-sec-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-(p-methylcyclohexyl), 4-(p-isopropylphenyl), 2-ethyl, varioussubstituents in the other 4 position:

-   dimethylsilanediyl(2-(p-methylcyclohexyl)-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-tert-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(p-methylcyclohexyl)-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-sec-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(p-methylcyclohexyl)-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(p-methylcyclohexyl)-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(p-methylcyclohexyl)-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(p-methylcyclohexyl)-4-(p-isopropylphenyl)indenyl)(2-ethyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-isopropyl, 4-(p-sec-butyl), 2-ethyl, various substituents in the other4 position:

-   dimethylsilanediyl(2-isopropyl-4-(p-sec-butyl)indenyl)(2-ethyl-4-(p-tert-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-sec-butyl)indenyl)(2-ethyl-4-(p-isopropylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-sec-butyl)indenyl)(2-ethyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-sec-butyl)indenyl)(2-ethyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-sec-butyl)indenyl)(2-ethyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-isopropyl-4-(p-sec-butyl)indenyl)(2-ethyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-sec-butyl, 4-(p-sec-butyl), 2-ethyl, various substituents in the other4 position:

-   dimethylsilanediyl(2-sec-butyl-4-(p-sec-butyl)indenyl)(2-ethyl-4-(p-tert-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-sec-butyl)indenyl)(2-ethyl-4-(p-isopropylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-sec-butyl)indenyl)(2-ethyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-sec-butyl)indenyl)(2-ethyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-sec-butyl)indenyl)(2-ethyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-sec-butyl-4-(p-sec-butyl)indenyl)(2-ethyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-(1-methylbutyl), 4-(p-sec-butyl), 2-ethyl, various substituents in theother 4 position:

-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-sec-butyl)indenyl)(2-ethyl-4-(p-tert-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-sec-butyl)indenyl)(2-ethyl-4-(p-isopropylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-sec-butyl)indenyl)(2-ethyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-sec-butyl)indenyl)(2-ethyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-sec-butyl)indenyl)(2-ethyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(1-methylbutyl)-4-(p-sec-butyl)indenyl)(2-ethyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-cyclopentyl, 4-(p-sec-butyl), 2-ethyl, various substituents in theother 4 position:

-   dimethylsilanediyl(2-cyclopentyl-4-(p-sec-butyl)indenyl)(2-ethyl-4-(p-tert-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-sec-butyl)indenyl)(2-ethyl-4-(p-isopropylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-sec-butyl)indenyl)(2-ethyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-sec-butyl)indenyl)2-ethyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-sec-butyl)indenyl)(2-ethyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclopentyl-4-(p-sec-butyl)indenyl)(2-ethyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-cyclohexyl, 4-(p-sec-butyl), 2-ethyl, various substituents in theother 4 position:

-   dimethylsilanediyl(2-cyclohexyl-4-(p-sec-butyl)indenyl)(2-ethyl-4-(p-tert-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-sec-butyl)indenyl)(2-ethyl-4-(p-isopropylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-sec-butyl)indenyl)(2-ethyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-sec-butyl)indenyl)(2-ethyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-sec-butyl)indenyl)(2-ethyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-cyclohexyl-4-(p-sec-butyl)indenyl)(2-ethyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,

2-(p-methylcyclohexyl), 4-(p-sec-butyl), 2-ethyl, various substituentsin the other 4 position:

-   dimethylsilanediyl(2-(p-methylcyclohexyl)-4-(p-sec-butyl)indenyl)(2-ethyl-4-(p-tert-butylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(p-methylcyclohexyl)-4-(p-sec-butyl)indenyl)(2-ethyl-4-(p-isopropylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(p-methylcyclohexyl)-4-(p-sec-butyl)indenyl)(2-ethyl-4-(p-cyclohexylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(p-methylcyclohexyl)-4-(p-sec-butyl)indenyl)(2-ethyl-4-(p-trimethylsilylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(p-methylcyclohexyl)-4-(p-sec-butyl)indenyl)(2-ethyl-4-(p-adamantylphenyl)indenyl)zirconium    dichloride,-   dimethylsilanediyl(2-(p-methylcyclohexyl)-4-(p-sec-butyl)indenyl)(2-ethyl-4-(p-tris(trifluoromethyl)methylphenyl)indenyl)zirconium    dichloride,-   and also the corresponding dimethylgermanediyl-, ethylidene-,    1-methylethylidene-, 1,1-dimethylethylidene-,    1,2-dimethylethylidene-, 1,1,2,2-tetramethylethylidene-,    dimethylmethylidene-, phenylmethylmethylidene- and    diphenylmethylidene-bridged compounds.

Possible methods of preparing metallocenes of the formula I aredescribed, for example, in Journal of Organometallic Chem. 288 (1985)63-67, and in the documents cited therein.

Selected metallocenes, particularly those which have specificallydifferent substituents in position 2 and position 4 on the indenylligand, achieve the object of the present invention particularly well.

The present invention accordingly also provides compounds of the formula

where

-   M-   is Ti, Zr or Hf, particularly preferably zirconium,-   R³-   is a hydrogen atom or a C₁-C₂₀ group, preferably C₁-C₁₈-alkyl such    as methyl, ethyl, n-butyl, n-hexyl or octyl, C₂-C₁₀-alkenyl,    C₃-C₁₅-alkylalkenyl, C₇-C₂₀-arylalkyl, fluorinated C₁-C₁₂-alkyl,    fluorinated C₆-C₁₈-aryl, fluorinated C₇-C₂₀-arylalkyl or fluorinated    C₇-C₂₀-alkylaryl,-   R⁵-   is different from R³ and is sec-butyl, isopropyl, 1-methylbutyl,    1-methylpentyl, cyclopentyl or cyclohexyl,-   R⁴, R⁶, R⁵⁰-   are identical or different and are each a hydrogen atom or a C₁-C₂₀    group, preferably C₁-C₁₈-alkyl such as methyl, ethyl, n-butyl,    cyclohexyl or octyl, C₂-C₁₀-alkenyl, C₃-C₁₅-alkylalkenyl,    C₆-C₁₈-aryl, C₅-C₁₈-heteroaryl, C₇-C₂₀-arylalkyl, C₇-C₂₀-alkylaryl,    fluorinated C₁-C₁₂-alkyl, fluorinated C₆-C₁₈-aryl, fluorinated    C₇-C₂₀-arylalkyl or fluorinated C₇-C₂₀-alkylaryl,-   R²⁰, R²¹-   are identical or different and are each a C₆-C₁₈-aryl group which    may be substituted, in particular phenyl, tolyl, xylyl,    tert-butylphenyl, 3,5-dimethylphenyl, 3,5-di-tert-butylphenyl,    4-ethylphenyl, 4-trimethylsilylphenyl, methoxyphenyl, naphthyl,    acenaphthyl, phenanthrenyl or anthracenyl, C₅-C₁₈-heteroaryl,    C₇-C₂₀-arylalkyl, C₇-C₂₀-alkylaryl, fluorinated C₆-C₁₈-aryl,    fluorinated C₇-C₂₀-arylalkyl or fluorinated C₇-C₂₀-alkylaryl and two    radicals R²⁰ or R²¹ may form a monocyclic or polycyclic ring system    which may in turn be substituted, where R²⁰ and R²¹ must not at the    same time be naphthyl, phenyl, phenanthrenyl or anthracenyl or    mixtures of naphthyl and phenyl,-   X-   is a halogen atom, in particular chlorine, an alkyl group, in    particular methyl, or a substituted or unsubstituted phenoxide,-   Q-   is a C₄-C₂₄-aryl ring system which may in turn bear R²⁰ groups as    substituents, a heteroaryl group which together with the    cyclopentadienyl ring form an azapentalene, thiapentalene or    phosphapentalene which may in turn be substituted by R²⁰,-   z-   is 0, 1, 2 or 3,-   l-   is an integer from zero to 4, preferably 1 or 2, particularly    preferably 1,-   B-   is a bridging structural element between the two indenyl radicals,-   with the exception of-   rac-Me₂Si[2-i-Pr-4-(1-naphthyl)ind)(2′-Me-4′PhInd)]ZrCl₂,-   rac-Me₂Si[2-i-Pr-4-(1-naphthyl)ind)(2′-Me-4′,5′-BenzInd)]ZrCl₂,-   rac-Me₂Si[2-i-Pr-4-(1-naphthyl)ind)(2′-Me-4′,5′-BenzInd)]ZrCl₂,-   rac-Me₂Si[2-i-Pr-4-phenylind(2′-ethyl-4′-PhInd)]ZrCl₂,-   rac-Me₂Si[2-i-Pr-4-(1-naphthylind)(2-ethyl-4′PhInd)]ZrCl₂,-   rac-Me₂Si[2-i-Pr-4-PhInd(2′-ethyl-4′-(1-naphthyl)ind)]ZrCl₂,-   rac-Me₂Si[2-i-Pr-4-PhInd(2′-Me-4′-PhInd)]ZrCl₂,-   rac-Me₂Si[2-i-Pr-4-(1-naphthyl)ind)(2′-ethyl-4′,5′-BenzInd)]ZrCl₂,-   rac-Me₂Si[2-i-Pr-4-PhInd)(2′-methyl-4′-(1-napbthyl)Ind)]ZrCl₂ and-   rac-Me₂Si[2-i-Pr-4(1-naphthyl)Ind(2′-methyl-4′-(1-naphthyl)Ind)]ZrCl₂.

Examples of B are groups M³R¹³R¹⁴, where M³ is silicon and R¹³ and R¹⁴are identical or different and are each a C₁-C₂₀ group such asC₁-C₁₀-alkyl, C₆-C₁₄-aryl, trialkylsilyl, in particular trimethylsilyl,triarylsilyl or alkylarylsilyl. Particularly preferred groups for B areSi(Me)₂, Si(Ph)₂, Si(MeEt), Si(PhMe), Si(PhEt), Si(Et)₂, where Ph issubstituted or unsubstituted phenyl and Et is ethyl. It is also possiblefor B together with one or more radicals R⁷ or R⁸ to form a monocyclicor polycyclic ring system.

Very particular preference is given to bridged metallocene compounds ofthe formula (II)

-   in which-   M-   is zirconium,-   R³-   is a hydrogen atom or a C₁-C₁₂-alkyl group, preferably an alkyl    group such as methyl, ethyl, n-butyl, n-hexyl or octyl, particularly    preferably methyl or ethyl,-   R⁵-   is sec-butyl, isopropyl, 1-methylbutyl, 1-methylpentyl, cyclopentyl,    cyclohexyl,-   R⁴, R⁶, R⁵⁰-   are hydrogen atoms,-   R²⁰, R²¹-   are identical or different and substitute the indenyl ring in the 4    position and are each a C₆-C₁₈-aryl group which may be substituted,    in particular phenyl, tolyl, xylyl, tert-butylphenyl,    3,5-dimethylphenyl, 3,5-di-tert-butylphenyl, 4-ethylphenyl,    4-trimethylsilylphenyl, methoxyphenyl, naphthyl, acenaphthyl,    phenanthrenyl or anthracenyl, C₅-C₁₈-heteroaryl, C₇-C₂₀-arylalkyl,    C₇-C₂₀-alkylaryl, fluorinated C₆-C₁₈-aryl, fluorinated    C₇-C₂₀-arylalkyl or fluorinated C₇-C₂₀-alkylaryl and two radicals    R²⁰ or R²¹ may form a monocylic or polycyclic ring system which may    in turn be substituted, where R²⁰ and R²¹ must not at the same time    be naphthyl, phenyl, phenanthrenyl or anthracenyl or mixtures of    naphthyl and phenyl,-   X-   is chlorine, methyl,-   Q-   is a butadienediyl group which together with the cyclopentadienyl    ring forms an indenyl system which may in turn bear R²⁰ groups as    substituents, heteroaryl which together with the cyclopentadienyl    ring forms an azapentalene, thiapentalene or phosphapentalene which    may in turn be substituted by R²⁰,-   l-   is an integer from zero to 4, preferably 1 or 2, particularly    preferably 1,-   B-   is a bridging structural element between the two indenyl radicals    and is preferably Si(Me)₂, Si(Ph)₂, Si(Et)₂, Si(MePh).

The invention further provides ligand systems of the formula (IIa) inwhich the radicals are defined as in formula (II).

The metallocenes of the present invention having the formulae I and IIare highly active catalyst components for the copolymerization ofolefins. Depending on the substitution pattern of the ligands, themetallocenes can be obtained as an isomer mixture. The metallocenes arepreferably used as pure isomers for the polymerization.

In place of the pure chiral bridged metallocene compounds of theformulae (I) and (II) (pseudo-rac), it is also possible to use mixturesof the metallocenes of the formulae (I) and (II) and the correspondingpseudo-meso metallocenes for preparing the catalyst.

Preference is given to using the pseudo-rac metallocenes of the formulae(I) and (II), but the use of pseudo-rac-enriched rac/meso mixtures isalso useful. The terms pseudo-rac and pseudo-meso correspond to theformulae II and IIa disclosed on page 8 of WO 00/31090.

Illustrative but nonlimiting examples of metallocenes of the presentinvention are:

-   dimethylsilanediyl(2-methyl-4-(4′-tert-butylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-(3′,5′-tert-butylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-(4′-tert-butylphenyl)indenyl)-L-hafnium    dichloride-   dimethylsilanediyl(2-methyl-4-(4′-tert-butylphenyl)indenyl)-L-titanium    dichloride-   dimethylsilanediyl(2-methyl-4-(4′-methylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-(4′-ethylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-(4′-n-propyl-phenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-(4′-isopropylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-(4′-n-butylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-(4′-hexylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-(4′-sec-butylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-phenyl-6-isopropylindenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-(1-naphthyl)-6-isopropylindenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-(2-naphthyl)-6-isopropylindenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-(4′-trimethylsilylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-(4′-adamantylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-acenaphthindenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-(2′,4′,6′-trimethylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-(3′,5′-dimethylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-ethyl-4-(3′,5′-di-tert-butylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-ethyl-4-(2′,4′,6′-trimethylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-(4′-trifluoromethylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-methyl-4-(4′-methoxyphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-ethyl-4-(4′-tert-butylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-ethyl-4-(4′-trifluoromethylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-ethyl-4-(4′-methoxyphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-ethyl-4-phenyl)indenyl-L-zirconium dichloride-   dimethylsilanediyl(2-ethyl-4-(4′-methylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-ethyl-4-(4′-ethylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-ethyl-4-(4′-n-propylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-ethyl-4-(4′-isopropylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-ethyl-4-(4′-n-butylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-ethyl-4-(4′-hexylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-ethyl-4-(4′-pentylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-ethyl-4-(4′-cyclohexylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-ethyl-4-(4′-sec-butylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-ethyl-4-(4′-tert-butylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-ethyl-4-(9-phenanthryl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-ethyl-4-phenyl-6-isopropylindenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-ethyl-4-(1-naphthyl)-6-isopropylindenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-ethyl-4-(2-naphthyl)-6-isopropylindenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-ethyl-4-(4′-trimethylsilylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-ethyl-4-(4′-adamantylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-n-propyl-4-phenyl)indenyl-L-zirconium    dichloride-   dimethylsilanediyl(2-n-propyl-4-(4′-methylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-n-propyl-4-(4′-ethylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-n-propyl-4-(4′-n-propylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-n-propyl-4-(4′-isopropylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-n-propyl-4-(4′-n-butylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-n-propyl-4-(4′-hexylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-n-propyl-4-(4′-cyclohexylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-n-propyl-4-(4′-sec-butylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-n-propyl-4-(4′-tert-butylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-propyl-4-(9-phenanthryl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-propyl-4-phenyl-6-isopropylindenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-propyl-4-(1-naphthyl)-6-isopropylindenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-propyl-4-(2-naphthyl)-6-isopropylindenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-propyl-4-(4′-trimethylsilylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-propyl-4-(4′-adamantylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-n-butyl-(4-phenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-n-butyl-4-(4′-methylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-n-butyl-4-(4′-ethylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-n-butyl-4-(4′-n-propylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-n-butyl-4-(4′-isopropylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-n-butyl-4-(4′-n-butylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-n-butyl-4-(4′-hexylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-n-butyl-4-(4′-cyclohexylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-n-butyl-4-(4′-sec-butylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-n-butyl-4-(4′-tert-butylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-n-butyl-4-(9-phenanthryl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-n-butyl-4-phenyl-6-isopropylindenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-n-butyl-4-(1-naphthyl)-6-isopropylindenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-n-butyl-4-(2-naphthyl)-6-isopropylindenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-n-butyl-4-(4′-trimethylsilylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-n-butyl-4-(4′-adamantylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-hexyl-(4-phenyl)indenyl)-L-zirconium dichloride-   dimethylsilanediyl(2-hexyl-4-(4′-methylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-hexyl-4-(4′-ethylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-hexyl-4-(4′-n-propylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-hexyl-4-(4′-isopropylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-hexyl-4-(4′-n-butylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-hexyl-4-(4′-hexylphenyl)-indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-hexyl-4-(4′-cyclohexylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-hexyl-4-(4′-sec-butylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-hexyl-4-(4′-tert-butylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-hexyl-4-(9-phenanthryl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-hexyl-4-phenyl-6-isopropylindenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-hexyl-4-(1-naphthyl)-6-isopropylindenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-hexyl-4-(2-naphthyl)-6-isopropylindenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-hexyl-4-(4′-trimethylsilylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-hexyl-4-(4′-adamantylphenyl)indenyl)-L-zirconium    dichloride-   dimethylsilanediyl(2-methylazapentalene)-L-zirconium dichloride-   dimethylsilanediyl(2-methylthiapentalene)-L-zirconium dichloride-   dimethylsilanediyl(2-methylphosphapentalene)-L-zirconium dichloride-   dimethylsilanediyl(2-ethylazapentalene)-L-zirconium dichloride-   dimethylsilanediyl(2-ethylthiapentalene)-L-zirconium dichloride-   dimethylsilanediyl(2-ethylphosphapentalene)-L-zirconium dichloride.

Here, L can be 2-isopropyl-4,5-benzindenyl;

-   2-isopropyl-4-(4′-tert-butylphenyl)indenyl;-   2-sec-butyl-4-(4′-tert-butylphenyl)indenyl;-   2-isopropyl-4-phenylindenyl;-   2-isopropyl-4-(2-naphthyl)indenyl;-   2-isopropyl-4-(1-naphthyl)indenyl;-   2-sec-butyl-4-phenylindenyl;-   2-sec-butyl-4-phenylindenyl [sic];-   2-sec-butyl-4,5-benzindenyl;-   2-sec-butyl-4-(2-naphthyl)indenyl;-   2-sec-butyl-4-(1-naphthyl)indenyl;-   2-(1-methylpentyl)-4,5-benzindenyl;-   2-(1-methylpentyl)-4-(4′-tert-butylphenyl)indenyl;-   2-(1-methylbutyl)-4-phenylindenyl;-   2-isopentyl-4-(2-naphthyl)indenyl;-   2-(1-methylbutyl)-4-(1-naphthylindenyl);-   2-(1-methylbutyl)-4,5-benzindenyl;-   2-(1-methylbutyl)-4-(4′-tert-butylphenyl)indenyl;-   2-(1-methylbutyl)-4-phenylindenyl;-   2-(1-methylbutyl)-4-(2-naphthyl)indenyl;-   2-(1-methylbutyl)-4-(1-naphthyl)indenyl;-   2-cyclopentyl-4,5-benzindenyl;-   2-cyclopentyl-4-(4′-tert-butylphenyl)indenyl;-   2-cyclopentyl-4-phenylindenyl;-   2-cyclopentyl-4-(2-naphthylindenyl);-   2-cyclopentyl-4-(1-naphthylindenyl);-   2-cyclohexyl-4,5-benzindenyl;-   2-cyclohexyl-4-(4′-tert-butylphenyl)indenyl;-   2-cyclohexyl-4-phenylindenyl;-   2-cyclohexyl-4-(2-naphthyl)indenyl;-   2-cyclohexyl-4-(1-naphthyl)indenyl;-   2-(1-methylbutyl)-4-(acenaphthphenyl)indenyl;-   2-(1-methylbutyl)-4-(acenaphthphenyl)indenyl [sic];-   2-isopropyl-4-(acenaphthphenyl)indenyl;-   2-sec-butyl-4-(acenaphthphenyl)indenyl;-   2-(1-methylbutyl)-4-(acenaphthphenyl)indenyl;-   2-(1-methylpentyl)-4-(acenaphthphenyl)indenyl;-   2-cyclopentyl-4-(acenaphthphenyl)indenyl;-   2-cyclohexyl-4-(acenaphthphenyl)indenyl.    Also preferred are the corresponding dimethylzirconium compounds,    the corresponding η⁴-butadienezirconium compounds; in addition,    preference is given to zirconium fragments as described in German    patent application P19854350, and also the corresponding compounds    having an Si(Ph)₂, Si(MeEt), Si(PhMe), Si(PhEt) and Si(Et)₂ bridge.

The novel metallocenes of the formulae I and II are particularlysuitable as constituents of catalyst systems for preparing polyolefinsby polymerization of at least one olefin in the presence of a catalystcomprising at least one cocatalyst and at least one metallocene.

The cocatalyst which together with a novel metallocene of the formula Ior II forms the catalyst system comprises at least one compound such asan aluminoxane or a Lewis acid or an ionic compound which reacts with ametallocene to convert it into a cationic compound.

The cocatalyst component which, in accordance with the presentinvention, may be present in the catalyst system comprises at least onecompound such as an aluminoxane or a Lewis acid or an ionic compoundwhich reacts with a metallocene to convert it into a cationic compound.

As aluminoxane, preference is given to using a compound of the formula(III)(R AlO)_(n)  (III)

Further suitable aluminoxanes can, for example, be cyclic as in formula(IV)

or linear as in formula (V)

or of the cluster type as in formula (VI)

Such aluminoxanes are described, for example, in JACS 117 (1995),6465-74, Organometallics 13 (1994), 2957-2969.

The radicals R in the formulae (III), (IV), (V) and (VI) can beidentical or different and can each be a C₁-C₂₀-hydrocarbon group suchas a C₁-C₆-alkyl group, a C₆-C₁₈-aryl group, benzyl or hydrogen; p is aninteger from 2 to 50, preferably from 10 to 35.

The radicals R are preferably identical and are methyl, isobutyl,n-butyl, phenyl or benzyl, particularly preferably methyl.

If the radicals R are different, they are preferably methyl andhydrogen, methyl and isobutyl or methyl and n-butyl, with hydrogenand/or isobutyl or n-butyl preferably being present in an amount of0.01-40% (number of radicals R).

The aluminoxane can be prepared in various ways by known methods. One ofthe methods is, for example, reacting an aluminum-hydrocarbon compoundand/or a hydridoaluminum-hydrocarbon compound with water (gaseous,solid, liquid or bound—for example as water of crystallization) in aninert solvent (e.g. toluene).

To prepare an aluminoxane having different alkyl groups R, two differenttrialkylaluminums (AIR₃+AIR′₃) corresponding to the desired compositionand reactivity are reacted with water (cf. S. Pasynkiewicz, Polyhedron 9(1990) 429 and EP-A-0,302,424).

Regardless of the method of preparation, all aluminoxane solutions havea varying content of unreacted aluminum starting compound which ispresent in free form of as adduct.

As Lewis acids, preference is given to using at least one organoboron ororganoaluminum compound containing organic C₁-C₂₀ groups such asbranched or unbranched alkyl or haloalkyl, e.g. methyl, propyl,isopropyl, isobutyl, trifluoromethyl, unsaturated groups such as aryl orhaloaryl, e.g. phenyl, tolyl, benzyl groups, p-fluorophenyl,3,5-difluorophenyl, pentachlorophenyl, pentafluorophenyl,3,4,5-trifluorophenyl and 3,5-di(trifluoromethyl)phenyl.

Examples of Lewis acids are trimethylaluminum, triethylaluminum,triisobutylaluminum, tributylaluminum, trifluoroborane, triphenylborane,tris(4-fluorophenyl)borane, tris(3,5-difluorophenyl)borane,tris(4-fluoromethylphenyl)borane, tris(pentafluorophenyl)borane,tris(tolyl)borane, tris(3,5-dimethylphenyl)borane,tris(3,5-difluorophenyl)borane and/or tris(3,4,5-trifluorophenyl)borane.Particular preference is given to tris(pentafluorophenyl)borane.

As ionic cocatalysts, preference is given to using compounds whichcontain a noncoordinating anion such astetrakis(pentafluorophenyl)borate, tetraphenylborate, SbF₆—, CF₃SO₃— orClO₄—. As cationic counterion, use is made of Lewis bases such asmethylamine, aniline, dimethylamine, diethylamine, N-methylaniline,diphenylamine, N,N-dimethylaniline, trimethylamine, triethylamine,tri-n-butylamine, methyldiphenylamine, pyridine,p-bromo-N,N-dimethylaniline, p-nitro-N,N-dimethylaniline,triethylphosphine, triphenylphosphine, diphenylphosphine,tetrahydrothiophene and triphenylcarbenium.

Examples of such ionic compounds which can be used according to thepresent invention are

-   triethylammonium tetra(phenyl)borate,-   tributylammonium tetra(phenyl)borate,-   trimethylammonium tetra(tolyl)borate,-   tributylammonium tetra(tolyl)borate,-   tributylammonium tetra(pentafluorophenyl)borate,-   tributylammonium tetra(pentafluorophenyl)aluminate,-   tripropylammonium tetra(dimethylphenyl)borate,-   tributylammonium tetra(trifluoromethylphenyl)borate,-   tributylammonium tetra(4-fluorophenyl)borate,-   N,N-dimethylanilinium tetra(phenyl)borate,-   N,N-diethylanilinium tetra(phenyl)borate,-   N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate,-   N,N-dimethylanilinium tetrakis(pentafluorophenyl)aluminate,-   N,N-dimethylcyclohexylammonium tetrakis(pentafluorophenyl)borate,-   N,N-dimethylbenzylammonium tetrakis(pentafluorophenyl)borate,-   di(propyl)ammonium tetrakis(pentafluorophenyl)borate,-   di(cyclohexyl)ammonium tetrakis(pentafluorophenyl)borate,-   triphenylphosphonium tetrakis(phenyl)borate,-   triethylphosphonium tetrakis(phenyl)borate,-   diphenylphosphonium tetrakis(phenyl)borate,-   tri(methylphenyl)phosphonium tetrakis(phenyl)borate,-   tri(dimethylphenyl)phosphonium tetrakis(phenyl)borate,-   triphenylcarbenium tetrakis(pentafluorophenyl)borate,-   triphenylcarbenium tetrakis(pentafluorophenyl)aluminate,-   triphenylcarbenium tetrakis(phenyl)aluminate,-   ferrocenium tetrakis(pentafluorophenyl)borate and/or-   ferrocenium tetrakis(pentafluorophenyl)aluminate.

Preference is given to triphenylcarbeniumtetrakis(pentafluorophenyl)borate and/or N,N-dimethylaniliniumtetrakis(pentafluorophenyl)borate.

It is also possible to use mixtures of at least one Lewis acid and atleast one ionic compound.

Further suitable cocatalyst components are borane or carborane compoundssuch as:

-   7,8-dicarbaundecaborane(13),-   undecahydrido-7,8-dimethyl-7,8-dicarbaundecaborane,-   dodecahydrido-1-phenyl-1,3-dicarbanonaborane,-   tri(butyl)ammonium undecahydrido-8-ethyl-7,9-dicarbaundecaborate,-   4-carbanonaborane(14), bis(tri(butyl)ammonium)nonaborate,-   bis(tri(butyl)ammonium)undecaborate,-   bis(tri(butyl)ammonium)dodecaborate,-   bis(tri(butyl)ammonium)decachlorodecaborate,-   tri(butyl)ammonium 1-carbadecaborate,-   tri(butyl)ammonium 1-carbadodecaborate,-   tri(butyl)ammonium 1-trimethylsilyl-1-carbadecaborate,-   tri(butyl)ammonium-   bis(nonahydrido-1,3-dicarbanonaborato)cobaltate(III),-   tri(butyl)ammonium-   bis(undecahydrido-7,8-dicarbaundecaborato)ferrate(III).

Further cocatalyst systems which can be used are combinations of atleast one amine and a support with organic element compounds, asdescribed in the patent WO 99/40129.

Preferred cocatalyst systems are the compounds of the formulae (A) and(B),

where R¹⁷ is

-   a hydrogen atom, a halogen atom, a C₁-C₄₀ group, in particular    C₁-C₂₀-alkyl, C₁-C₂₀-haloalkyl, C₁-C₁₀-alkoxy, C₆-C₂₀-aryl,    C₆-C₂₀-haloaryl, C₆-C₂₀-aryloxy, C₇-C₄₀-arylalkyl,    C₇-C₄₀-haloarylalkyl, C₇-C₄₀-alkylaryl or C₇-C₄₀-haloalkylaryl. R¹⁷    can also be an —OSiR₃ group, where R are identical or different and    are as defined for R¹⁷ except for a further —OSiR₃ group.

Further preferred cocatalysts are compounds in general which are formedby reaction of at least one compound of the formula (C) and/or (D)and/or (E) with at least one compound of the formula (F),R_(f) ¹⁷B-(DR⁷)_(g)  (C)R₂ ¹⁷B—X—BR₂ ¹⁷  (D)

-   R⁷-   can be a hydrogen atom or a boron-free C₁-C₄₀ group such as    C₁-C₂₀-alkyl, C₆-C₂₀-aryl, C₇-C₄₀-arylalkyl, C₇-C₄₀-alkylaryl, and-   R¹⁷-   is as defined above,-   X is an element of main group VI of the Periodic Table of the    Elements or an NR group, where R is a hydrogen atom or a    C₁-C₂₀-hydrocarbon radical such as C₁-C₂₀-alkyl or C₁-C₂₀-aryl,-   D-   is an element of main group VI of the Periodic Table of the Elements    or an NR group, where R is a hydrogen atom or a C₁-C₂₀-hydrocarbon    radical such as C₁-C₂₀-alkyl or C₁-C₂₀-aryl,-   f-   is an integer from zero to 3,-   g-   is an integer from 0 to 3, with z+y being not equal to 0,-   h-   is an integer from 1 to 10.

If desired, the bimetallic compounds are combined with an organometalliccompound of the formula VIII [M⁴R¹⁹ _(q)]_(k), where M⁴ is an element ofmain group I, II or III of the Periodic Table of the Elements, R¹⁹ areidentical or different and are each a hydrogen atom, a halogen atom or aC₁-C₄₀ group, in particular a C₁-C₂₀-alkyl, C₆-C₄₀-aryl,C₇-C₄₀-arylalkyl or C₇-C₄₀-alkylaryl group, q is an integer from 1 to 3and k is an integer from 1 to 4.

Examples of cocatalytically active compounds of the formulae A and Bare:

The organometallic compounds of the formula VIII are preferablyunchanged Lewis acids in which M⁴ is lithium, magnesium and/or aluminum,in particular aluminum. Examples of preferred organometallic compoundsof the formula VIII are trimethylaluminum, triethylaluminum,triisopropylaluminum, trihexylaluminum, trioctylaluminum,tri-n-butylaluminum, tri-n-propylaluminum, triisoprenylaluminum,dimethylaluminum monochloride, diethylaluminum monochloride,diisobutylaluminum monochloride, methylaluminum sesquichloride,ethylaluminum sesquichloride, dimethylaluminum hydride, diethylaluminumhydride, diisopropylaluminum hydride, dimethylaluminumtrimethylsiloxide, dimethylaluminum triethylsiloxide, phenylalanine,pentafluorophenylalane and o-tolylalane.

Further compounds which can be used as cocatalysts, either inunsupported or supported form, are those mentioned in EP-A-924223, DE19622207.9, EP-A-601830, EP-A-824112, EP-A-824113, WO 99/06414,EP-A-811627, WO97/11775, DE 19606167.9 and DE 19804970.

The support component of the catalyst system of the present inventioncan be any organic or inorganic, inert solid, in particular a poroussupport such as talc, inorganic oxides and finely divided polymerpowders (e.g. polyolefins).

Suitable inorganic oxides may be found among those of elements of groups2, 3, 4, 5, 13, 14, 15 and 16 of the Periodic Table of the Elements.Examples of oxides preferred as supports include silicon dioxide,aluminum oxide and also mixed oxides of the elements calcium, aluminum,silicon, magnesium, titanium and corresponding oxide mixtures. Otherinorganic oxides which can be used alone or in combination with thelast-mentioned preferred oxidic supports are, for example, MgO, ZrO₂ ,TiO₂ or B₂O₃, to name only a few.

The support materials used have a specific surface area in the rangefrom 10 to 1000 m²/g, a pore volume in the range from 0.1 to 5 ml/g anda mean particle size of from 1 to 500 μm. Preference is given tosupports having a specific surface area in the range from 50 to 500 μm,a pore volume in the range from 0.5 to 3.5 ml/g and a mean particle sizein the range from 5 to 350 μm. Particular preference is given tosupports having a specific surface area in the range from 200 to 400m²/q, a pore volume in the range from 0.8 to 3.0 ml/g and a meanparticle size of from 10 to 200 μm.

If the support material used naturally has a low moisture content orresidual solvent content, dehydration or drying before use can beomitted. If this is not the case, for instance when using silica gel assupport material, dehydration or drying is advisable. Thermaldehydration or drying of the support material can be carried out underreduced pressure and under an inert gas blanket (e.g. nitrogen) at thesame time. The drying temperature is in the range from 100 to 1000° C.,preferably from 200 to 800° C. In this case, the pressure is notcritical. The duration of the drying process can be from 1 to 24 hours.Shorter or longer drying times are possible, provided that equilibriumwith the hydroxyl groups on the support surface can be achieved underconditions selected, which normally takes from 4 to 8 hours.

Dehydration or drying of the support material can also be achieved bychemical means, by reacting the adsorbed water and the hydroxyl groupson the surface with suitable passivating agents. The reaction with thepassivating reagent enables the hydroxyl groups to be convertedcompletely or partially into a form which leads to no adverseinteractions with the catalytically active centers. Suitable passivatingagents are, for example, silicon halides and silanes, e.g. silicontetrachloride, chlorotrimethylsilane, dimethylaminotrichlorosilane, ororganoinetallic compounds of aluminum, boron and magnesium, for exampletrimethylaluminum, triethylaluminum, triisobutylaluminum,triethylborane, dibutylmagnesium. Chemical dehydration or passivation ofthe support material is carried out by, for example, reacting asuspension of the support material in a suitable solvent with thepassivating reagent in pure form or as a solution in a suitable solventwith exclusion of air and moisture. Suitable solvents are, for example,aliphatic or aromatic hydrocarbons such as pentane, hexane, heptane,toluene or xylene. Passivation is carried out at from 25° C. to 120° C.,preferably from 50 to 70° C. Higher and lower temperatures are possible.The reaction time is from 30 minutes to 20 hours, preferably from 1 to 5hours. After the chemical dehydration is complete, the support materialis isolated by filtration under inert conditions, washed one or moretimes with suitable inert solvents as have been described above andsubsequently dried in a stream of inert gas or under reduced pressure.

Organic support materials such as finely divided polyolefin powders(e.g. polyethylene, polypropylene or polystyrene) can also be used andshould likewise be freed of adhering moisture, solvent residues or otherimpurities by appropriate purification and drying operations before use.

To prepare the supported catalyst system, at least one of theabove-described metallocene components in a suitable solvent is broughtinto contact with at least one cocatalyst component, preferably giving asoluble reaction product, an adduct or a mixture.

The preparation obtained in this way is then mixed with the dehydratedor passivated support material, the solvent is removed and the resultingsupported metallocene catalyst system is dried in order to ensure thatthe solvent is completely or largely removed from the pores of thesupport material. The supported catalyst is obtained as a free-flowingpowder.

A process for preparing a free-flowing and, if desired, prepolymerizedsupported catalyst system comprises the following steps:

-   a) preparation of a metallocene/cocatalyst mixture in a suitable    solvent or suspension medium, with the metallocene component having    one of the above-described structures;-   b) application of the metallocene/cocatalyst mixture to a porous,    preferably inorganic dehydrated support;-   c) removal of the major part of the solvent from the resulting    mixture;-   d) isolation of the supported catalyst system;-   e) if desired, prepolymerization of the resulting supported catalyst    system using one or more olefinic monomer(s) to give a    prepolymerized supported catalyst system.

Preferred solvents for the preparation of the metallocene/cocatalystmixture are hydrocarbons and hydrocarbon mixtures which are liquid atthe reaction temperature selected and in which the individual componentspreferably dissolve. However, the solubility of the individualcomponents is not a prerequisite as long as it is ensured that thereaction product of metallocene and cocatalyst components is soluble inthe solvent selected. Examples of suitable solvents include alkanes suchas pentane, isopentane, hexane, heptane, octane and nonane; cycloalkanessuch as cyclopentane and cyclohexane; and aromatics such as benzene,toluene, ethylbenzene and diethylbenzene. Very particular preference isgiven to toluene.

The amounts of aluminoxane and metallocene used in the preparation ofthe supported catalyst system can be varied within a wide range.Preference is given to a molar ratio of aluminum to the transition metalin the metallocene of from 10:1 to 1000:1, very particularly preferablyfrom 50:1 to 500:1.

In the case of methylaluminoxane, preference is given to using 30%strength solutions in toluene; however, the use of 10% strengthsolutions is also possible.

For the preactivation, the metallocene in the form of a solid isdissolved in a solution of the aluminoxane in a suitable solvent. It isalso possible to dissolve the metallocene separately in a suitablesolvent and subsequently to combine this solution with the aluminoxanesolution. Preference is given to using toluene.

The preactivation time is from 1 minute to 200 hours.

The preactivation can take place at room temperature (25° C.). Inparticular cases, the use of higher temperatures can shorten thepreactivation time required and effect an additional increase in theactivity. In this case, the expression higher temperatures refers to arange from 50 to 100° C.

The preactivated solution or the metallocene/cocatalyst mixture issubsequently combined with an inert support material, usually silicagel, which may be in the form of a dry powder or as a suspension in oneof the abovementioned solvents. The support material is preferably usedas powder. The order of addition is immaterial. The preactivatedmetallocene/cocatalyst solution or the metallocene/cocatalyst mixturecan be added to the support material or else the support material can beintroduced into the solution.

The volume of the preactivated solution or of the metallocene/cocatalystmixture can exceed 100% of the total pore volume of the support materialused or else can be up to 100% of the total pore volume.

The temperature at which the preactivated solution or themetallocene/cocatalyst mixture is brought into contact with the supportmaterial can vary in a range from 0 to 100° C. However, lower or highertemperatures are also possible.

Subsequently, the solvent is completely or mostly removed from thesupported catalyst system, during which the mixture can be stirred and,if desired, also heated. Preference is given to removing both thevisible proportion of the solvent and also the proportion in the poresof the support material. The removal of the solvent can be carried outin a conventional way with use of reduced pressure and/or flushing withinert gas. During the drying procedure, the mixture can be heated untilthe free solvent has been removed, which usually takes from 1 to 3 hoursat a preferred temperature in the range from 30 to 60° C. The freesolvent is the visible proportion of solvent in the mixture. In thepresent context, residual solvent is the proportion enclosed in thepores.

As an alternative to complete removal of the solvent, it is alsopossible to dry the supported catalyst system only to a particularresidual solvent content, with the free solvent having been completelyremoved. The supported catalyst system can subsequently be washed with alow-boiling hydrocarbon such as pentane or hexane and dried again.

The supported catalyst system prepared according to the presentinvention can either be used directly for the polymerization of olefinsor can be prepolymerized using one or more olefinic monomers prior toits use in a polymerization process. The procedure for prepolymerizingsupported catalyst systems is described, for example, in WO 94/28034.

As additive, it is possible to add a small amount of an olefin,preferably an α-olefin (for example vinylcyclohexane, styrene orphenyldimethylvinylsilane), as modifying component or an antistatic (asdescribed in U.S. Ser. No. 08/365280 now abandoned) during or after thepreparation of the supported catalyst system. The molar ratio ofadditive to metallocene component compound I is preferably from 1:1000to 1000:1, very particularly preferably from 1:20 to 20:1.

The present invention also provides a process for preparing a polyolefinby polymerization of one or more olefins in the presence of the catalystsystem of the present invention comprising at least one transition metalcomponent of the formula I. For the purposes of the present invention,the term polymerizaton refers to both homopolymerization andcopolymerization.

Preference is given to polymerizing olefins of the formulaR_(m)—CH═CH—R_(n), where R_(m) and R_(n) are identical or different andare each a hydrogen atom or an organic radical having from 1 to 20carbon atoms, in particular from 1 to 10 carbon atoms, and R_(m) andR_(n) together with the atoms connecting them may form one or morerings.

Examples of such olefins are 1-olefins having 2-20, preferably from 2 to10, carbon atoms, e.g. ethene, propene, 1-butene, 1-pentene, 1-hexene,4-methyl-1-pentene or 1-octene, styrene, dienes such as 1,3-butadiene,1,4-hexadiene, vinylnorbornene, norbornadiene or ethylnorbornadiene andcyclic olefins such as norbornene, tetracyclododecene ormethylnorbornene. In the process of the present invention, preference isgiven to homopolymerizing propene or ethene or copolymerizing propenewith ethene and/or with one or more 1-olefins having from 4 to 20 carbonatoms, e.g. butene, hexene or vinylcyclohexane, and/or one or moredienes having from 4 to 20 carbon atoms, e.g. 1,4-butadiene,norbornadiene, ethylidenenorbornene or ethylnorbornadiene. Examples ofsuch copolymers are ethene-propene copolymers orethene-propene-1,4-hexadiene terpolymers.

The polymerization is carried out at from 0 to 300° C., preferably from50 to 200° C., very particularly preferably 50-80° C. The pressure isfrom 0.5 to 2000 bar, preferably from 5 to 64 bar.

The polymerization can be carried out in solution, in bulk, insuspension or in the gas phase, continuously or batchwise, in one ormore stages.

The catalyst system prepared according to the present invention can beused as sole catalyst component for the polymerization of olefins havingfrom 2 to 20 carbon atoms, but is preferably used in combination with atleast one alkyl compound of elements of main groups I to III of thePeriodic Table, e.g. an aluminum, magnesium or lithium alkyl or analuminoxane. The alkyl compound is added to the monomer or suspensionmedium and serves to free the monomer of substances which can adverselyaffect the catalyst activity. The amount of alkyl compound added dependson the quality of the monomers used.

As molar mass regulator and/or to increase the activity, hydrogen isadded if necessary.

The catalyst system can be introduced in pure form into thepolymerization system or can be admixed with inert components such asparaffins, oils or waxes to allow better metering. Furthermore, anantistatic can be metered into the polymerization system either togetherwith or separately from the catalyst system used.

The polymers (also (co)polymers of the present invention below) preparedusing the catalyst system of the present invention have a uniformparticle morphology and contain no fines. No deposits or caked materialare obtained in the polymerization using the catalyst system of thepresent invention.

The (co)polymers of the present invention include both homopolymers andrandom copolymers of polypropylene. Their molar mass M_(w) (measuredusing gel permeation chromatography) is in the range from 100 000 to 1000 000 g/mol and their M_(w)/M_(n) (measured using gel permeationchromatography) is in the range from 1.8 to 4.0, preferably from 1.8 to3.5. Random copolymers of propylene comprise subordinate amounts ofmonomers which can be copolymerized with propylene, for exampleC₂-C₈-alk-1-enes such as ethylene, 1-butene, 1-pentene, 1-hexene or4-methyl-1-pentene. It is also possible to use two or more differentcomonomers; this then gives, for example, random terpolymers.

Homopolymers of propylene or copolymers of propylene with up to 50% byweight of other copolymerized 1-alkenes having up to 8 carbon atoms areparticularly useful. The copolymers of propylene are random copolymersor block or impact copolymers. If the copolymers of propylene have arandom structure, they generally contain up to 50% by weight, preferablyup to 15% by weight, particularly preferably up to 1% by weight, ofother 1-alkenes having up to 8 carbon atoms, in particular ethylene,1-butene, 4-methyl-1-pentene or a mixture of ethylene and 1-butene,ethylene and 1-hexene or ethylene and 4-methyl-1-pentene.

The copolymers of the present invention also include block or impactcopolymers of propylene, in the case of which a propylene homopolymer,e.g. one according to the present invention, or a random copolymeraccording to the present invention of propylene with from 0.001 to 15%by weight, preferably from 0.01 to 6% by weight, of other 1-alkeneshaving up to 8 carbon atoms (e.g. ethylene, 1-butene, 1-hexene,1-octene, 4-methyl-1-pentene) is prepared in the first stage and apropylene-ethylene copolymer which has an ethylene content of from 15 to80% by weight and may further comprise additional C₄-C₈-alk-1-enes (e.g.ethylene, 1-butene, 1-hexene, 1-octene, 4-methyl-1-pentene) is thenpolymerized onto this in the second stage. In general, the amount of thepropylene-ethylene copolymer (which may contain ethylene, 1-butene,1-hexene, 1-octene, 4-methyl-1-pentene as further monomers) polymerizedon is such that the copolymer produced in the second stage is present ina proportion of from 3 to 60% by weight in the end product.

Propylene homopolymers and copolymers of the present invention have acontent of meso-configured diads (measured using 13C-NMR spectroscopy,see examples) of at least 90%, preferably at least 95% and particularlypreferably at least 98%.

Random copolymers of the present invention have a minimum content of 2,1insertions (measured using 13C-NMR spectroscopy, see examples) ofpropene monomers ((intra-chain) reverse insertions). The randomcopolymers of the present invention have at least four, preferably atleast six and particularly preferably at least 7.5, (intra-chain)reverse insertions per polymer chain. This property of the copolymers ofthe present invention is at present explained by the followingmechanistic theory, although its correctness does not impose arestriction on the subject matter of the invention: random copolymerswhich are not according to the present invention are produced usingsingle-site catalysts (e.g. metallocene catalysts) which allow thegrowing polymer chain to be terminated on a coordinated ethylene after areverse insertion. This reaction route leads to a cis-2-butenyl endgroup (which can be reduced to an n-butyl group by the hydrogen whichmay be present in the reactor) and to a low content of (intra-chain)reverse insertions. This mechanism generally leads directly todecreasing molar masses with increasing ethylene content. In the case ofthe copolymers of the present invention, the catalyst system of thepresent invention suppresses the indicated chain termination mechanism,so that chain continuation follows reverse insertions. This leadsdirectly to copolymers whose molar mass increases with increasingethylene content.

Random copolymers produced using single-site catalysts (e.g. metallocenecatalysts) are distinguished from, for example, Ziegler-Natta catalyzedcopolymers having a comparable comonomer content by a series ofproperties.

-   -   Thus, single-site-catalyzed copolymers have a uniform comonomer        distribution over their molar mass spectrum. Such a distribution        can be determined, for example, by means of coupled GPC-IR        measurement.    -   In single-site-catalyzed copolymers, the comonomers are randomly        distributed, while Ziegler-Natta-catalyzed copolymers tend to        incorporate the comonomer in blocks even at low comonomer        contents. It fluctuates only slightly as long as the fractions        make up a sufficiently large proportion (at least 10%) of the        total polymer. In the case of copolymers of the present        invention, the monomer content fluctuates up to a maximum of        10%, preferably a maximum of 5%, particularly preferably a        maximum of 1.5%, between the fractions having a sufficiently        large proportion.    -   Single-site-catalyzed copolymers have a narrow molar mass        distribution ex reactor (generally M_(w)/M_(n),<=3.5).        Ziegler-Natta-catalyzed copolymers have broader molar mass        distributions ex reactor.    -   Furthermore, single-site-catalyzed copolymers have a low        proportion of soluble material. At an ethylene content of 10 mol        %, the proportion of ether-soluble material is less than 2% by        weight.

In addition, a combination of the abovementioned features leads to thepolymers of the present invention (homopolymers and copolymers) beingeluted within a narrow temperature range in a TREF (for measurementmethod, see examples). In the case of the homopolymers and randomcopolymers of the present invention, from 80 to 100% by weight areeluted within a temperature interval extending from 15° C. below to 15°C. above the temperature at which maximum elution occurs (“peaktemperature”). The range preferably extends from 15° C. below to 10° C.above the peak temperature and particularly preferably from 10° C. belowto 10° C. above the peak temperature.

The polymers prepared by the process of the present invention aresuitable for producing high-strength, hard and rigid shaped bodies suchas fibers, filaments, injection-molded parts, films, sheets or largehollow bodies (e.g. pipes). The moldings display, in particular, a hightoughness, even at below 20° C., combined with high stiffness.

Moldings (e.g. injection-molded articles) made of the block polymers ofthe present invention are generally produced using the customaryinjection-molding process known to those skilled in the art and have anovel property combination of stiffness, toughness and transparency andadditionally display little stress whitening.

The E modulus, as a measure of the stiffness of the copolymers of thepresent invention, measured in a tensile test in accordance with ISO527, is generally in the range from 500 to 6 000 MPa, preferably from800 to 2 000 MPa and very particularly preferably from 900 to 1 400 MPa.

The Charpy impact toughness, as a measure of the toughness of thecopolymers of the present invention, measured in accordance with ISO179-2/1eU, is >200 kJ/m² at 23° C. and is >20 kJ/m² at −20° C.Preferably, no fracture of the test specimen is recorded at 23° C.

The haze, as complementary value for transparency (% transparency−%haze=100%), determined in accordance with ASTM D 1003, is preferablyless than 40%, particularly preferably less than 30%, for the copolymersof the present invention.

The injection-molded articles produced according to the invention mayfurther comprise the customary thermoplastic additives in the customaryamounts. Possible additives are antistatics, lubricants such as fattyacid amides, for example erucamide, stabilizers, flame retardants,neutralizing agents such as calcium stearate, colorants such as pigmentsor liquid dyes, carbon black and also inorganic fillers such as talc,chalk, aluminum oxide, aluminum sulfate, barium sulfate, calciummagnesium carbonate, silicon dioxide, titanium dioxide, glass fibers andorganic fillers such as polyesters, polystyrene, polyamide andhalogenated organic polymers.

Further preferred additives are nucleating agents such as talc, alkalimetal, alkaline earth metal or aluminum salts of alkylcarboxylic,arylcarboxylic, arylalkylcarboxylic or alkylarylcarboxylic acids,certain polymers such as polyvinylcyclohexane or polycyclopentane, andalso polyhydroxy compounds such as sorbitol derivatives. Preference isgiven to talc, aluminum salts, alkali metal salts and alkaline earthmetal salts of cyclic arylalkylcarboxylic acids, and also sorbitolderivatives. Particular preference is given to sorbitol derivatives.

The homopolymers and copolymers of the present invention are suitablefor producing hard and stiff moldings, fibers, filaments,injection-molded parts, films, sheets or large hollow bodies (e.g.pipes) having a high ultimate tensile strength.

The block copolymers of the present invention are well suited toproducing moldings by means of injection molding and extrusion. They areparticularly useful for producing injection-molded articles for variousapplications, as described below by way of example.

The block copolymers of the present invention are suitable forapplications

-   in the audio/video/computer sector,-   for example SACD/DVD/CD/minidisk/CD-ROM packaging, cassette outers,    boxes for disks and tapes, chip cards, protective sheathing for chip    cards;-   in the medical sector,-   for example Petri dishes, cuvettes, blood analysis tubes, pipettes,    disposable pipette tips, drug packaging, in particular bottles,    vials, tubes, blisters or lids, syringe cylinders and syringe    plungers;-   for dairy and food packaging, in particular for refrigerated and    frozen products,-   for example yoghurt tubs, dessert tubs, milk and dairy product    packaging such as cheese packaging, delicatessen tubs,    single-portion containers, TV dinner containers, tubes, bottles such    as ketchup bottles, bottle caps, containers for refrigerated and    frozen goods, e.g. ice cream containers;-   in the household articles sector, in particular for use in    refrigerator and freezer applications,-   for example drinking cups, cutlery, bowls, containers for food, in    particular for refrigerated and frozen goods, e.g. cheese boxes or    sausage boxes, microwave applications, catering, blow-molded    containers, bottles, tubes, waste containers, filter housings,    coathangers, insulated flasks, baby's bottles, tops for baby's    bottles, pacifier parts, cartridges, clips;-   in the office articles sector,-   for example in-trays and out-trays, sorting boxes, magazine boxes,    wastepaper baskets, upright filing boxes, files, spines of files,    drawing utensils, cartridges, ink cartridges, office equipment such    as hole punches or staplers, writing instruments such as ballpoint    pen outers or marker pens;-   in the cosmetics packaging sector,-   for example containers for creams, lotions and toothpaste, e.g.    tubes or dispensing bottles, ointment containers, caps, bottles,    tubes, outers, pots, boxes such as wet-wipe boxes, roll-on    deodorants (ball and housing), closures, caps, lids of all types;-   in the laundry detergent packaging sector,-   for example sales packaging for laundry detergents, e.g. boxes,    bottles or tubes, measuring cups, dispensing balls;-   in the bathroom sector,-   for example toothbrush holders, cups, brush bodies, wet shaver    bodies, trays and shelves in the bathroom, bathroom furniture,    mirror cabinets, toilet seats and toilet lids, soap dispensers;-   in the electrical goods sector,-   for example coffee machine housings, viewing windows for coffee    machines or electric kettles, egg cooker covers, internal parts for    refrigerators and freezers, e.g. lining, crispers or baskets,    bathroom scales, irons, lampshades, housings for electrical    appliances, e.g. computer and monitor housings, tool casings;-   in the storage and transport container sector,-   for example screw containers, tool containers, blister packaging,    boxes, baskets, bottles, tubes, cartridges, cases, pallets, viewing    windows, transport containers, jewelry and gift packaging,    wall-mounted holders;-   in the toy sector,-   for example toys or toy components and also packaging for them, e.g.    packaging for playing cards, toy storage containers;-   in the laboratory sector,-   for example measuring cups, measuring cylinders, laboratory flasks,    for example for aggressive substances, buckets, cases;-   in the motor vehicle sector,-   for example covers for interior lights, substitutes for glass,    polycarbonate or polystyrene, impact-resistant interior lining and    exterior cladding;-   in the furniture sector, preferably for outdoor furniture,-   for example transparent, colored or uncolored garden furniture;-   in the gardening requisites sector,-   for example flower boxes, flower pots, watering cans, water    containers, compost bins, buckets, irrigation systems, components of    garden equipment.

The invention is illustrated by the following examples, which do not,however, restrict the scope of the invention.

I Synthesis of the Metallocenes

General procedures: the preparation and handling of the organometalliccompounds was carried out with exclusion of air and moisture under argon(Schlenk technique or glove-box). All solvents required were flushedwith argon and dried over molecular sieves before use.

The preparation of heteropentalene systems is carried out using a methodof Ewen et al., Metalorganic Catalysts for Synthesis and Polymerization,1999, Springer-Verlag, 150-169.

EXAMPLE 1 Preparation of 2-chloroisopentyrophenone

29.2 g of magnesium turnings and 80 ml of THF are placed in a reactionvessel. After starting the reaction using 1/60 (2 ml) of the totalamount of the 1-isobutyl bromide, the remaining amount of the 136 ml ofisobutyl bromide is added dropwise as a mixture with 300 ml of THF overa period of 1 hour under reflux. The dark brown solution is then heatedfor another 1 hour under reflux. 15 ml of DME are subsequently added.After cooling to room temperature, the Grignard suspension is added alittle at a time by means of a syringe to a suspension of 305 mg ofcopper(I) iodide and 137.6 g of 2-chlorobenzonitrile dissolved in 240 mlof THF. Toward the end of the Grignard addition, the suspension isrefluxed for 2 hours. A solution of 327 ml of water is added dropwise tothe suspension while stirring vigorously. Subsequently, 218 ml of 37%strength hydrochloric acid are added over a period of 20 minutes. Theemulsion is stirred vigorously for 1 hour at 50° C., after which theaqueous phase is separated from the organic phase. The solvent isremoved completely and the residue is subsequently admixed with 50 ml oftoluene. The toluene is removed on a rotary evaporator, with theremaining water being distilled off azeotropically. This leaves 205.5 gof crude product which is used without further purification for the nextstep.

1H-NMR (400 MHz, CDCl₃): 7.37-7.26 (m, 4H, arom-H), 2.81 (d, 2H, CH₂—H),2.23 (m, 1H, CH—H), 0.97 (d, 6H, isopropyl-CH₃).

EXAMPLE 2 Preparation of 2-isopropyl-7-chloro-1-indanone

134 g of 2-chloropentyrophenone are placed in a reaction vessel at roomtemperature together with 200.6 g of urotropin and treated dropwise with173.6 g of acetic anhydride. The resulting mixture is stirred for 4.5hours at 80° C. After the reaction is complete, 142.3 ml of water andsubsequently 360 g of 20% strength NaOH are added at 80° C. and theviscous reaction mixture is brought into solution. After cooling to roomtemperature, the mixture is extracted twice with a total of 400 ml ofdichloromethane and the combined organic phases are washed twice with atotal of 200 ml of 10% strength hydrochloric acid and dried over 140 gof sodium sulfate. The organic dichloromethane phase is added dropwiseover a period of 2.5 hours to 273 ml of concentrated sulfuric acid whichhas been heated to 70° C., with the rate of addition being chosen sothat the temperature of the sulfuric acid solution does not go below 70°C. during the reaction as a result of dichloromethane distilling off.The sulfuric acid solution is subsequently allowed to cool to roomtemperature and the cooled solution is introduced while stirringvigorously into 1000 ml of ice water. The sulfuric acid solution is thenextracted three times with a total of 700 ml of dichloromethane, and thecombined organic phases are washed with 250 ml of saturated sodiumhydrogen carbonate solution and dried over 140 g of sodium sulfate. Thesolvent is removed on a rotary evaporator. The crude product obtained isdistilled in an oil pump vacuum via a Vigreux column with column head.This gives 67.34 g (47%) of 2-isopropyl-7-chloro-1-indanone as a yellowliquid.

1H-NMR (400 MHz, CDCl₃): 7.39-7.28 (m, 3H, arom-H), 3.14 (dd, 1H,CH₂—H), 2.91 (dd, 1H, CH₂—H), 2.70 (m, 1H, CH—H), 2.42 (m, 1H,isopropyl-CH), 1.08, 0.84 (each d, each 3H, isopropyl-CH₃).

EXAMPLE 3 Preparation of 2-isopropyl-7-(4′-tert-butylphenyl)-1-indanone

28.0 g of 2-isopropyl-7-chloro-1-indanone, 28.64 g of4-tert-butylphenylboronic acid, 35.56 g of sodium carbonate, 302 ml ofethylene glycol and 21.6 ml of water are placed in a reaction vessel.The mixture is degassed a number of times by careful application of anoil pump vacuum and subsequent admission of argon, and thus saturatedwith argon. It is heated to 80° C. and a freshly prepared catalystsolution comprising 60.23 mg of palladium acetate and 1.79 ml of anaqueous TPPTS solution (0.6 molar) in 25 ml of water is then added whilestirring vigorously and the reaction mixture is refluxed for 5 hourswith further stirring until completely reacted. After cooling to roomtemperature, 300 ml of water are added. After renewed cooling to roomtemperature, the ethylene glycol phase is washed 6 times with a total of900 ml of toluene. The combined toluene phases are washed twice with atotal of 250 ml of sodium chloride solution and dried over 150 g ofsodium sulfate. Removal of the solvent on a rotary evaporator, drying ofthe residue and subsequent distillation in an oil pump vacuum gives 40 g(97%) of 2-isopropyl-7-(4′-tert-butylphenyl)-1-indanone as anorange-brown, viscous oil.

1H-NMR (400 MHz, CDCl₃): 7.39-7.24 (m, 7H, arom-H), 3.17 (dd, 1H,CH₂—H), 2.94 (dd, 1H, CH₂—H), 2.63 (m, 1H, CH—H), 2.38 (m, 1H,isopropyl-CH), 1.31 (s, 9H, tert-butyl-H), 1.06, 0.78 (each d, each 3H,isopropyl-CH₃).

EXAMPLE 4 Preparation of 2-isopropyl-4-(4′-tert-butylphenyl)indene

4.83 g of sodium borohydride and 39.1 g of2-isopropyl-7-(4′-tert-butylphenyl)-1-indanone together with 118 ml oftoluene are placed in a reaction vessel. At 50° C., 22.5 ml of methanolare slowly added and the reaction mixture is stirred for 6 hours at 50°C. After cooling to room temperature, 50 ml of 2N sulfuric acid areadded and the mixture is stirred vigorously for another 30 minutes. Themixture is subsequently transferred to a separating funnel, the phasesare separated and the aqueous phase is shaken twice with a total of 60ml of 2N sulfuric acid. The organic phases are combined and dried overmagnesium sulfate. The solvent of the reaction mixture is removedvirtually completely and 200 ml of toluene and 0.4 g ofp-toluenesulfonic acid are subsequently added to the residue. Water isdistilled from the reaction mixture by heating for 1.5 hours on a waterseparator until reaction is complete. The reaction mixture issubsequently washed once with 100 ml of saturated sodium hydrogencarbonate solution and dried over magnesium sulfate. After separatingoff the magnesium sulfate, the residue is dried in an oil pump vacuum.This gives 35.7 g of 2-isopropyl-4-(4′-tert-butylphenyl)indene (totalyield: 96%).

1H-NMR (400 MHz, CDCl₃): 7.11-6.91 (m, 7H, arom-H), 6.48 (s, 1H,olefin-H), 3.17 (s, 2H, CH₂—H), 2.55 (m, 1H, isopropyl-CH), 1.15 (s, 9H,tert-butyl-H), 0.96 (d, 6H, isopropyl-CH₃).

2-Isopropyl-4-phenylindene (2), 2-isopropyl-4-(2-naphthyl)indene (3) and2-isopropyl-4-(1-naphthyl)indene (4) are prepared analogously bycoupling with the corresponding boronic acids as described in Example 3.The NMR data of these compounds are shown in the table below.

Aromatics Isopropyl- Isopropyl- range Olefin-H Aliphatic H CH CH₃ 27.13-6.95 6.53 3.19 2.61 0.97 3 7.45-7.30 6.24 3.67 2.81 0.98 47.40-7.26 6.22 3.60 2.80 0.96

EXAMPLE 5 Preparation of2-methyl-4-(4′-tert-butylphenyl)-1-dimethylchlorosilylindene

20.0 g (76 mmol) of 2-methyl-4-(4′-tert-butylphenyl)indene together with160 ml of toluene and 5 ml of DME are placed in a reaction vessel. 28.4ml (76 mmol) of a butyllithium solution are added dropwise to thissolution, and the mixture is stirred for another 1 hour at 80° C. afterthe addition is complete. The resulting reaction solution is slowlyadded dropwise to a solution of 27.7 ml (229 mmol) ofdimethyldichlorosilane in 260 ml of THF which has been precooled to −40°C. The reaction mixture is allowed to warm to room temperature and isstirred overnight. The solvent is subsequently removed in an oil pumpvacuum and the residue is taken up in 100 ml of toluene. The insolublelithium chloride is separated off via a G4 frit and the solvent isremoved from the filtrate in an oil pump vacuum. This gives 24.8 g (98%)of the desired product.

1H-NMR (400 MHz, CDCl₃): 7.3-7.0 (m, 7H, arom-H), 6.7 (s, 1H,olefin-H-indene), 3.5 (s, 1H, H-indene), 2.1 (s, 3H, CH₃), 1.3 (s, 9H,tert-butyl), 0.3, 0.05 (each s, each 3H, CH₃—Si).

EXAMPLE 6 Preparation of2-ethyl-4-(4′-tert-butylphenyl)-1-dimethylchlorosilylindene

20.0 g (72.4 mmol) of 2-ethyl-4-(4′-tert-butylphenyl)indene togetherwith 153 ml of toluene and 4.8 ml of DME are placed in a reactionvessel. 27.0 ml (72.4 mmol) of a butyllithium solution are addeddropwise to this solution, and the mixture is stirred for another 1 hourat 80° C. after the addition is complete. The resulting reactionsolution is slowly added dropwise to a solution of 26.3 ml (217 mmol) ofdimethyldichlorosilane in 248 ml of THF which has been precooled to −40°C. The reaction mixture is allowed to warm to room temperature and isstirred overnight. The solvent is subsequently removed in an oil pumpvacuum and the residue is taken up in 100 ml of toluene. The insolublelithium chloride is separated off via a G4 frit and the solvent isremoved from the filtrate in an oil pump vacuum. This gives 25.5 g (95%)of the desired product.

1H-NMR (400 MHz, CDCl₃): 7.3-7.0 (m, 7H, arom-H), 6.7 (s, 1H,olefin-H-indene), 3.6 (s, 1H, H-indene), 2.6, 2.4 (each m, 1H, CH₂), 1.3(s, 9H, tert-butyl), 1.1 (t, 3H, CH₃), 0.3, 0.0 (each s, each 3H,CH₃—Si).

EXAMPLE 7 Preparation of2-methyl-(4-thiapentalene)-1-dimethylchlorosilane

20.0 g (148 mmol) of 2-methyl-(2-hydrocyclopenta[2,1-b]thiophene)together with 260 ml of toluene and 8 ml of DME are placed in a reactionvessel. 55.3 ml (148 mmol) of a butyllithium solution are added dropwiseto this solution, and the mixture is stirred for another 1 hour at 80°C. after addition is complete. The resulting reaction solution is slowlyadded dropwise to a solution of 53.9 ml (446 mmol) ofdimethyldichlorosilane in 460 ml of THF which has been precooled to −40°C. The reaction mixture is allowed to warm to room temperature and isstirred overnight. The solvent is subsequently removed in an oil pumpvacuum and the residue is taken up in 100 ml of toluene. The insolublelithium chloride is separated off via a G4 frit and the solvent isremoved from the filtrate in an oil pump vacuum. This gives 29.1 g (86%)of the desired product.

1H-NMR (400 MHz, CD₂Cl₂): 7.3-6.8 (m, 2H), 6.7-6.4 (m, 1H), 4.0-3.4 (m,2H), 2.6 (m, 3H, CH₃), 0.3, −0.05 (each s, each 3H, CH₃—Si).

EXAMPLE 8 Preparation of2-methyl-4-(1-naphthyl)-1-dimethylchlorosilylindene

18.5 g (72 mmol) of 2-methyl-4-(1-naphthyl)indene together with 150 mlof toluene and 4.8 ml of DME are placed in a reaction vessel. 26.9 ml(72 mmol) of a butyllithium solution are added dropwise to thissolution, and the mixture is stirred for another 1 hour at 80° C. afteraddition is complete. The resulting reaction solution is slowly addeddropwise to a solution of 26.2 ml (216 mmol) of dimethyldichlorosilanein 250 ml of THF which has been precooled to −40° C. The reactionmixture is allowed to warm to room temperature and is stirred overnight.The solvent is subsequently removed in an oil pump vacuum and theresidue is taken up in 100 ml of toluene. The insoluble lithium chlorideis separated off via a G4 frit and the solvent is removed from thefiltrate in an oil pump vacuum. This gives 23.4 g (93%) of the desiredproducts.

1H-NMR (400 MHz, CDCl₃): 7.45-7.32 (m, 7H, arom-H), 6.26 (s, 1H,olefin-H-indene), 3.69 (s, 1H, H-indene), 2.15 (s, 3H, CH₃), 0.46, 0.18(each s, each 3H, CH₃—Si).

Other indenyldimethylchlorosilane andheteropentalenedimethylchlorosilane systems can be synthesized usingmethods analogous to the above-described examples.

EXAMPLE 9 Preparation ofdimethylsilanediyl(2-methyl-4-(4′-tert-butylphenyl)-1-indene)(2-isopropyl-4-(4′-tert-butylphenyl)-1-indene)

16.8 g (57.7 mmol) of 2-isopropyl-7-(4′-tert-butylphenyl)-1-indenetogether with 131 ml of toluene and 5.0 ml of THF are placed in areaction vessel, and 21.5 ml of butyllithium solution (2.68 M intoluene) are added all at once at room temperature. After the additionis complete, the mixture is heated to 80° C. and stirred at thistemperature for 1 hour. This reaction solution is subsequently allowedto cool to room temperature and is then added dropwise to a solution of20.5 g (57.7 mmol) of2-methyl-7-(4′-tert-butylphenyl)-1-indenyldimethylchlorosilane in 246 mlof toluene over a period of 1 hour. The mixture is subsequently stirredovernight at room temperature. 60 ml of water are added and the phaseswhich form are separated. The organic phase is washed with 100 ml ofwater and the combined aqueous phases are extracted twice with a totalof 100 ml of toluene. The combined organic phases are then dried overmagnesium sulfate. After separating off the magnesium sulfate, thesolvent is removed and the residue is dried in an oil pump vacuum. Thedesireddimethylsilanediyl(2-methyl-4-(4′-tert-butylphenyl)-1-indene)(2-isopropyl-4-(4′-tert-butylphenyl)-1-indene)is isolated in a yield of 31.6 g (90%) (purity: 90%).

1H-NMR (400 MHz, CDCl₃): 7.5-7.1 (m, 14H, arom-H), 6.71, 6.62 (each s,each 1H, olefin-H-indene), 3.31, 3.35 (each s, each 2H, CH₂—H), 2.65 (m,1H, CH-isopropyl), 2.41 (s, 3H, CH₃—H), 1.35, 1.33 (each s, each 9H,tert-butyl), 1.15 (d, 6H, isopropyl-CH₃), 0.0, 0.2 (each d, each 3H,Si—CH₃).

EXAMPLE 10 Preparation ofdimethylsilanediyl(2-ethyl-4-(4′-tert-butylphenyl)-1-indene)(2-isopropyl-4-(4′-tert-butylphenyl)-1-indene)

9.4 g (32.5 mmol) of 2-isopropyl-7-(4′-tert-butylphenyl)-1-indenetogether with 74 ml of toluene and 3 ml of THF are placed in a reactionvessel, and 12.1 ml of butyllithium solution (2.68 M in toluene) areadded all at once at room temperature. After the addition is complete,the mixture is heated to 80° C. and stirred at this temperature for 1hour. This reaction solution is subsequently allowed to cool to roomtemperature and is added dropwise to a solution of 12.0 g (32.5 mmol) of2-ethyl-7-(4′-tert-butylphenyl)-1-indenyldimethylchlorosilane in 138 mlof toluene over a period of 1 hour. The mixture is subsequently stirredovernight at room temperature. 50 ml of water are added and the phaseswhich form are separated. The organic phase is washed with 100 ml ofwater and the combined aqueous phases are extracted twice with a totalof 100 ml of toluene. The combined organic phases are then dried overmagnesium sulfate. After separating off the magnesium sulfate, thesolvent is removed and the residue is dried in an oil pump vacuum. Thedesireddimethylsilanediyl(2-ethyl-4-(4′-tert-butylphenyl)-1-indene)(2-isopropyl-4-(4′-tert-butylphenyl)-1-indene)is isolated in a yield of 19.3 g (95%) (purity: 90%).

1H-NMR (400 MHz, CDCl₃): 7.48-7.12 (m, 14H, arom-H), 6.91, 6.72 (each s,each 1H, olefin-H-indene), 3.51, 3.47 (each s, each 2H, CH₂—H), 2.81 (m,2H, CH₂—H), 2.65 (m, 1H, CH-isopropyl), 1.41, 1.37 (each s, each 9H,tert-butyl), 1.28 (d, 6H, isopropyl-CH₃), 0.98 (t, 3H, CH₃—H), 0.1, 0.3(each d, each 3H; Si—CH₃).

EXAMPLE 11 Preparation ofdimethylsilanediyl(2-methyl-4-phenyl)-1-indene)(2-isopropyl-4-(4′-tert-butylphenyl)-1-indene)

16.8 g (57.7 mmol) of 2-isopropyl-7-(4′-tert-butylphenyl)-1-indenetogether with 131.2 ml of toluene and 5 ml of THF are placed in areaction vessel, and 21.5 ml of butyllithium solution (2.68 M intoluene) are added all at once at room temperature. After the additionis complete, the mixture is heated to 80° C. and stirred at thistemperature for 1 hour. This reaction solution is subsequently allowedto cool to room temperature and is added dropwise to a solution of 17.2g (57.7 mmol) of 2-methyl-4-phenyl-1-indenyldimethylchlorosilane in 150ml of toluene over a period of 1 hour. The mixture is subsequentlystirred overnight at room temperature. 50 ml of water are added and thephases which form are separated. The organic phase is washed with 100 mlof water and the combined aqueous phases are extracted twice with atotal of 100 ml of toluene. The combined organic phases are then driedover magnesium sulfate. After separating off the magnesium sulfate, thesolvent is removed and the residue is dried in an oil pump vacuum. Thedesireddimethylsilanediyl(2-methyl-4-phenyl-1-indene)(2-isopropyl-4-(4′-tert-butylphenyl)-1-indene)is isolated in a yield of 24.9 g (80%) (purity: 80%).

1H-NMR (400 MHz, CDCl₃): 7.35-7.10 (m, 14H, arom-H), 6.89, 6.69 (each s,each 1H, olefin-H-indene), 3.45, 3.39 (each s, each 2H, CH₂—H), 2.55 (m,1H, CH-isopropyl), 2.39 (s, 3H, CH₃—H), 1.40 (s, 9H, tert-butyl), 1.3(d, 6H, isopropyl-CH₃), 0.05, 0.25 (each d, each 3H, Si—CH₃).

EXAMPLE 12 Preparation ofdimethylsilanediyl(2-methylthiapentalene)(2-isopropyl-4-(4′-tert-butylphenyl)indene)

8.4 g (28.9 mmol) of 2-isopropyl-4-(4′-tert-butylphenyl)indene togetherwith 80 ml of toluene and 3.0 ml of THF are placed in a reaction vesseland admixed with 10.7 ml (33.9 mmol) of butyllithium solution. After theaddition is complete, the reaction solution is heated to 80° C. andstirred at this temperature for 1 hour. This solution is subsequentlyallowed to cool to room temperature and added dropwise at roomtemperature to a solution of 6.6 g (28.9 mmol) of2-methyl-1-thiapentalenyldimethylchlorosilane in 140 ml of toluene overa period of 1 hour. The resulting reaction mixture is stirred overnightat room temperature. The reaction solution is then poured into 100 ml ofwater and the organic phase is separated off. The aqueous phase isextracted once with 50 ml of toluene and the combined organic phases aredried over magnesium sulfate. The solvent is taken off in an oil pumpvacuum to give 10.2 g (75%) of the desired ligand system.

1H-NMR (400 MHz, CDCl₃): 7.6-6.8 (m, 10H, arom-H), 6.5 (m, 1H), 6.6, 6.4(each d, each 1H, H-indene), 3.7-3.6 (dd, 2H), 3.3-3.0 (m, 2H), 2.55 (m,1H, CH-isopropyl), 2.4 (m, 3H, CH₃), 1.40 (s, 9H, tert-butyl), 1.25 (d,6H, isopropyl-CH₃), −0.1, −0.3 (each d, each 3H, CH₃—Si).

EXAMPLE 13 Preparation ofdimethylsilanediyl(2-isopropyl-4-(4′-tert-butylphenyl)indene)(2-methyl-4,5-benzoindene)

17.0 g (58.4 mmol) of 2-isopropyl-7-(4′-tert-butylphenyl)-1-indenetogether with 135 ml of toluene and 5 ml of THF are placed in a reactionvessel, and 21.8 ml of butyllithium solution (2.68 M in toluene) areadded all at once at room temperature. After the addition is complete,the mixture is heated to 80° C. and stirred at this temperature for 1hour. This reaction solution is subsequently allowed to cool to roomtemperature and is added dropwise to a solution of 15.9 g (58.4 mmol) of2-methyl-4,5-benzoindenyldimethylchlorosilane in 150 ml of toluene overa period of 1 hour. The mixture is subsequently stirred overnight atroom temperature. 70 ml of water are added and the phases which form areseparated. The organic phase is washed with 100 ml of water and thecombined aqueous phases are extracted twice with a total of 100 ml oftoluene. The combined organic phases are then dried over magnesiumsulfate. After separating off the magnesium sulfate, the solvent isremoved and the residue is dried in an oil pump vacuum. The desireddimethylsilanediyl(2-isopropyl-4-(4′-tert-butylphenyl)indene)(2-methyl-4,5-benzoindene)is isolated in a yield of 24.5 g (80%) (purity: 80%).

1H-NMR (400 MHz, CDCl₃): 7.6-7.1 (m, 12H, arom-H), 6.7, 6.5 (each d,each 1H, H-indene), 3.2, 3.05 (each s, each 2H, CH₂—H), 2.55 (m, 1H,CH-isopropyl), 2.4 (s, 3H, CH₃), 1.4 (s, 9H, tert-butyl), 1.2 (d, 6H,isopropyl-CH₃), 0.1, −0.15 (each d, each 3H, Si—CH₃).

EXAMPLE 14 Preparation ofdimethylsilanediyl(2-isopropyl-4-(1-naphthyl)indene)(2-methyl-4-(4′-tert-butylphenyl)indene

16.6 g (58.4 mmol) of 2-isopropyl-4-(1-naphthyl)-1-indene together with135 ml of toluene and 5 ml of THF are placed in a reaction vessel, and21.8 ml of butyllithium solution (2.68 M in toluene) are added all atonce at room temperature. After the addition is complete, the mixture isheated to 80° C. and stirred at this temperature for 1 hour. Thisreaction solution is subsequently allowed to cool to room temperatureand is added dropwise to a solution of 20.7 g (58.4 mmol) of2-methyl-7-(4′-tert-butylphenyl)-1-indenyldimethylchlorosilane in 240 mlof toluene over a period of 1 hour. The mixture is subsequently stirredovernight at room temperature. 60 ml of water are added and the phaseswhich form are separated. The organic phase is washed with 100 ml ofwater and the combined aqueous phases are extracted twice with a totalof 100 ml of toluene. The combined organic phases are then dried overmagnesium sulfate. After separating off the magnesium sulfate, thesolvent is removed and the residue is dried in an oil pump vacuum. Thedesireddimethylsilanediyl(2-isopropyl-4-(1-naphthyl)indene)(2-methyl-4-(4′-tert-butylphenyl)indene)is isolated in a yield of 31.6 g (90%) (purity: 80%).

1H-NMR (400 MHz, CDCl₃): 7.4-7.05 (m, 17H, arom-H), 6.8, 6.6 (each d,each 1H, H-indene), 3.2, 3.1 (each s, each 2H, CH₂—H), 2.45 (m, 1H,CH-isopropyl), 2.35 (s, 3H, CH₃), 1.4 (s, 9H, tert-butyl), 1.25 (d, 6H,isopropyl-CH₃), 0.15, −0.25 (each d, each 3H, Si—CH₃).

EXAMPLE 15 Preparation ofdimethylsilanediyl(2-isopropyl-4-phenyl-1-indene)(2-methyl-4-(4′-tert-butylphenyl)-1-indene)

13.6 g (58 mmol) of 2-isopropyl-4-phenyl-1-indene together with 135 mlof toluene and 5 ml of THF are placed in a reaction vessel, and 21.6 mlof butyllithium solution (2.68 M in toluene) are added all at once atroom temperature. After the addition is complete, the mixture is heatedto 80° C. and stirred at this temperature for 1 hour. This reactionsolution is subsequently allowed to cool to room temperature and isadded dropwise to a solution of 19.2 g (58 mmol) of2-methyl-4-(4′-tert-butylphenyl)-1-indenyldimethylchlorosilane in 150 mlof toluene over a period of 1 hour. The mixture is subsequently stirredovernight at room temperature. 70 ml of water are added and the phaseswhich form are separated. The organic phase is washed with 90 ml ofwater and the combined aqueous phases are extracted twice with a totalof 100 ml of toluene. The combined organic phases are then dried overmagnesium sulfate. After separating off the magnesium sulfate, thesolvent is removed and the residue is dried in an oil pump vacuum. Thedesireddimethylsilanediyl(2-isopropyl-4-phenyl-1-indene)(2-methyl-4-(4′-tert-butylphenyl-1-indene)is isolated in a yield of 25.9 g (85%).

1H-NMR (400 MHz, CDCl₃): 7.45-7.10 (m, 14H, arom-H), 6.91, 6.71 (each s,each 1H, olefin-H-indene), 3.45, 3.40 (each s, each 2H, CH₂—H), 2.46 (m,1H, CH-isopropyl), 2.45 (3H, CH₃—H), 1.40 (s, 9H, tert-butyl), 1.15 (d,6H, isopropyl-CH₃), 0.00, −0.20 (each d, each 3H, Si—CH₃).

EXAMPLE 16 Preparation ofdimethylsilanediyl(2-isopropyl-4-phenyl-1-indene)(2-ethyl-4-(4′-tert-butylphenyl)-1-indene)

13.6 g (58 mmol) of 2-isopropyl-4-phenyl-1-indene together with 135 mlof toluene and 5 ml of THF are placed in a reaction vessel, and 21.6 mlof butyllithium solution (2.68 M in toluene) are added all at once atroom temperature. After the addition is complete, the mixture is heatedto 80° C. and stirred at this temperature for 1 hour. This reactionsolution is subsequently allowed to cool to room temperature and isadded dropwise to a solution of 20.0 g (58 mmol) of2-ethyl-4-(4′-tert-butylphenyl)-1-indenyldimethylchlorosilane in 150 mlof toluene over a period of 1 hour. The mixture is subsequently stirredovernight at room temperature. 70 ml of water are added and the phaseswhich form are separated. The organic phase is washed with 90 ml ofwater and the combined aqueous phases are extracted twice with a totalof 100 ml of toluene. The combined organic phases are then dried overmagnesium sulfate. After separating off the magnesium sulfate, thesolvent is removed and the residue is dried in an oil pump vacuum. Thedesireddimethylsilanediyl(2-isopropyl-4-phenyl-1-indene)(2-ethyl-4-(4′-tert-butylphenyl)-1-indene)is isolated in a yield of 22.0 g (70%).

1H-NMR (400 MHz, CDCl₃): 7.48-7.13 (m, 14H, arom-H), 6.91, 6.72 (each s,each 1H, olefin-H-indene), 3.52, 3.47 (each s, each 2H, CH₂—H), 2.81 (m,2H, CH₂—H), 2.65 (m, 1H, CH-isopropyl), 1.37 (each s, each 9H,tert-butyl), 1.28 (d, 6H, isopropyl-CH₃), 0.96 (t, 3H, CH₃—H), 0.1, −0.3(each d, each 3H, Si—CH₃).

EXAMPLE 17 Preparation ofdimethylsilanediyl(2-methyl-4-(1-naphthyl)indene)(2-isopropyl-4-(4′-tert-butylphenyl)indene)

16.8 g (57.7 mmol) of 2-isopropyl-4-(4′-tert-butylphenyl)indene togetherwith 140 ml of toluene and 5 ml of THF are placed in a reaction vessel,and 21.5 ml of butyllithium solution (2.68 M in toluene) are added allat once at room temperature. After the addition is complete, the mixtureis heated to 80° C. and stirred at this temperature for 1 hour. Thisreaction solution is subsequently allowed to cool to room temperatureand is added dropwise to a solution of 20.1 g (57.7 mmol) of2-methyl-4-(1-naphthyl)-1-indenyldimethylchlorosilane in 240 ml oftoluene over a period of 1 hour. The mixture is subsequently stirredovernight at room temperature. 60 ml of water are added and the phaseswhich form are separated. The organic phase is washed with 800 ml ofwater and the combined aqueous phases are extracted twice with a totalof 80 ml of toluene. The combined organic phases are then dried overmagnesium sulfate. After separating off the magnesium sulfate, thesolvent is removed and the residue is dried in an oil pump vacuum. Thedesireddimethylsilanediyl(2-methyl-4-(1-naphthyl)indene)(2-isopropyl-4-(4′-tert-butylphenyl)indene)is isolated in a yield of 22.6 g (65%).

1H-NMR (400 MHz, CDCl₃): 7.6-7.1 (m, 16H, arom-H), 6.7, 6.5 (each d,each 1H, H-indene), 3.2, 3.1 (each s, each 2H, CH₂—H), 2.45 (m, 1H,CH-isopropyl), 2.35 (s, 3H, CH₃), 1.35 (s, 9H, tert-butyl), 1.25 (d, 6H,isopropyl-CH₃), 0.10, −0.20 (each d, each 3H, Si—CH₃).

EXAMPLE 18 Preparation ofdimethylsilanediyl(2-methyl-4-(4′-tert-butylphenyl)indenyl)(2-isopropyl-4-(4′-tert-butylphenyl)indenyl)zirconiumdichloride

36.6 g ofdimethylsilanediyl(2-methyl-4-(4′-tert-butylphenyl)-1-indene)(2-isopropyl-4-(4′-tert-butylphenyl)-1-indene)together with 366 ml of diethyl ether are placed in a reaction vesseland admixed at room temperature with 44.9 ml of butyllithium solution(2.68 M in toluene). After the addition is complete, the mixture isstirred overnight at this temperature. It is subsequently cooled to 0°C. and 14.0 g of zirconium tetrachloride are added a little at a time.The mixture is allowed to warm to room temperature and is stirred foranother 2 hours at this temperature. The orange precipitate formed isthen separated off via a G3 frit and washed twice with 50 ml each timeof THF and once with 70 ml of pentane. The residue is subsequently driedin an oil pump vacuum. The complex is obtained in a yield of 23.5 g(50%).

1H-NMR (400 MHz, CDCl₃): pseudo-rac: 7.7-6.9 (m, 14H, arom-H), 3.26 (m,1H, CH-isopropyl), 2.23 (s, 3H, CH₃), 1.31 (s, 18H, tert-butyl), 1.33,1.32 (each s, each 3H, Si—CH₃), 1.08, 1.03 (each d, each 3H,isopropyl-CH₃). Pseudo-meso: 7.7-6.7 (m, 14H, arom-H), 3.18 (m, 1H,CH-isopropyl), 2.44 (s, 3H, CH₃), 1.34 (s, 18H, tert-butyl), 1.47, 1.25(each s, each 3H, Si—CH₃), 1.20 (m, 6H, isopropyl-CH₃).

EXAMPLE 19 Preparation ofdimethylsilanediyl(2-ethyl-4-(4′-tert-butylphenyl)indenyl)(2-isopropyl-4-(4′-tert-butylphenyl)indenyl)zirconiumdichloride

18.1 g (29 mmol) ofdimethylsilanediyl(2-ethyl-4-(4′-tert-butylphenyl)-1-indene)(2-isopropyl-4-(4′-tert-butylphenyl)-1-indene)together with 181 ml of diethyl ether are placed in a reaction vesseland admixed at room temperature with 21.7 ml of butyllithium solution(2.68 M in toluene). After the addition is complete, the mixture isstirred overnight at this temperature. It is subsequently cooled to 0°C. and 6.8 g (29 mmol) of zirconium tetrachloride are added a little ata time. The mixture is allowed to warm to room temperature and isstirred for another 2 hours at this temperature. The orange precipitateformed is then separated off via a G3 frit and washed twice with 50 mleach time of THF and once with 70 ml of pentane. The residue issubsequently dried in an oil pump vacuum. The complex is obtained in ayield of 13.6 g (60%).

1H-NMR (400 MHz, CDCl₃): pseudo-rac: 7.6-6.8 (m, 14H, arom-H), 3.15 (m,1H, CH-isopropyl), 2.7, 2.5 (each m, each 1H, CH₂), 1.38, 1.35 (each s,each 3H, Si—CH₃), 1.32 ([lacuna], 18H, tert-butyl), 1.10, 1.05 (each d,each 3H, CH₃-isopropyl), 0.85 (t, 3H, CH₃). Pseudo-meso: 7.7-6.7 (m,14H, arom-H), 3.25 (m, 1H, CH-isopropyl), 2.6, 2.4 (each m, each 1H,CH₂), 1.50, 1.21 (each s, each 3H, Si—CH₃), 1.33 ([lacuna], 18H,tert-butyl), 1.20 (m, 6H, CH₃-isopropyl), 1.05 (t, 3H, CH₃).

EXAMPLE 20 Preparation ofdimethylsilanediyl(2-methyl-4-(4′-tert-butylphenyl)indenyl)(2-isopropyl-4-phenylindenyl)zirconiumdichloride

16.0 g (29 mmol) ofdimethylsilanediyl(2-isopropyl-4-phenyl-1-indene)(2-methyl-4-(4′-tert-butylphenyl)-1-indene)together with 190 ml of diethyl ether are placed in a reaction vesseland admixed at room temperature with 21.7 ml of butyllithium solution(2.68 M in toluene). After the addition is complete, the mixture isstirred overnight at this temperature. It is subsequently cooled to 0°C. and 6.8 g (29 mmol) of zirconium tetrachloride are added a little ata time. The mixture is allowed to warm to room temperature and isstirred for another 4 hours at this temperature. The orange precipitateformed is then separated off via a G4 frit and washed twice with 60 mleach time of THF and once with 100 ml of pentane. The residue issubsequently dried in an oil pump vacuum. The complex is obtained in ayield of 11.4 g (55%).

1H-NMR (400 MHz, CDCl₃): pseudo-rac: 7.8-7.0 (m, 15H, arom-H), 3.24 (m,1H, CH-isopropyl), 2.22 (s, 3H, CH₃), 1.31 (s, 9H, tert-butyl), 1.32,1.30 (each s, each 3H, Si—CH₃), 1.10, 1.05 (each d, each 3H,isopropyl-CH₃). Pseudo-meso: 7.8-6.9 (m, 15H, arom-H), 3.21 (m, 1H,CH-isopropyl), 2.41 (s, 3H, CH₃), 1.33 (s, 18H, tert-butyl), 1.49, 1.27(each s, each 3H, Si—CH₃), 1.17 (m, 6H, isopropyl-CH₃).

EXAMPLE 21 Preparation ofdimethylsilanediyl(2-methyl-4-phenyl-1-indenyl)(2-isopropyl-4-(4′-tert-butylphenyl)-1-indenyl)zirconiumdichloride

17.1 g (31 mmol) ofdimethylsilanediyl(2-methyl-4-phenyl-1-indene)(2-isopropyl-4-(4′-tert-butylphenyl)-1-indene)together with 200 ml of diethyl ether are placed in a reaction vesseland admixed at room temperature with 23.2 ml of butyllithium solution(2.68 M in toluene). After the addition is complete, the mixture isstirred overnight at this temperature. It is subsequently cooled to 0°C. and 7.3 g (31 mmol) of zirconium tetrachloride are added a little ata time. The mixture is allowed to warm to room temperature and isstirred for another 3 hours at this temperature. The orange precipitateformed is then separated off via a G4 frit and washed twice with 60 mleach time of THF and once with 100 ml of pentane. The residue issubsequently dried in an oil pump vacuum. The complex is obtained in ayield of 10.4 g (50%).

1H-NMR (400 MHz, CDCl₃): pseudo-rac: 7.8-7.1 (m, 15H, arom-H), 3.24 (m,1H, CH-isopropyl), 2.23 (s, 3H, CH₃), 1.31 (s, 9H, tert-butyl), 1.32,1.30 (each s, each 3H, Si—CH₃), 1.11, 1.06 (each d, each 3H,isopropyl-CH₃). Pseudo-meso: 7.8-7.0 (m, 15H, arom-H), 3.22 (m, 1H,CH-isopropyl), 2.41 (s, 3H, CH₃), 1.33 (s, 18H, tert-butyl), 1.49, 1.27(each s, each 3H, Si—CH₃), 1.18 (m, 6H, isopropyl-CH₃).

EXAMPLE 22 Preparation ofdimethylsilanediyl(2-ethyl-4-(4′-tert-butylphenyl)indenyl)(2-isopropyl-4-phenylindenyl)zirconiumdichloride

10.8 g (20 mmol) ofdimethylsilanediyl(2-isopropyl-4-phenyl-1-indene)(2-ethyl-4-(4′-tert-butylphenyl)-1-indene)together with 120 ml of toluene and 5 ml of THF are placed in a reactionvessel and admixed at room temperature with 15.0 ml of butyllithiumsolution (2.68 M in toluene). After the addition is complete, themixture is stirred at this temperature for 4 hours. It is subsequentlycooled to 0° C. and 4.7 g (20 mmol) of zirconium tetrachloride are addeda little at a time. The mixture is allowed to warm to room temperatureand is stirred for another 5 hours at this temperature. The orangeprecipitate formed is then separated off via a G3 frit and washed twicewith 50 ml each time of THF. The residue is subsequently dried in an oilpump vacuum. The complex is obtained in a yield of 6.3 g (45%).

1H-NMR (400 MHz, CDCl₃): pseudo-rac: 7.5-6.8 (m, 15H, arom-H), 3.19 (m,1H, CH-isopropyl), 2.5, 2.3 (each m, each 1H, CH₂), 1.33, 1.31 (each s,each 3H, Si—CH₃), 1.32 (s, 9H, tert-butyl), 1.10, 1.07 (each d, each 3H,CH₃-isopropyl), 0.87 (t, 3H, CH₃). Pseudo-meso: 7.7-6.7 (m, 14H,arom-H), 3.27 (m, 1H, CH-isopropyl), 2.6, 2.3 (each m, each 1H, CH₂),1.35 (each s, each 3H, Si—CH₃), 1.34 (s, 18H, tert-butyl), 1.25 (m, 6H,CH₃-isopropyl), 0.93 (t, 3H, CH₃).

EXAMPLE 23 Preparation ofdimethylsilanediyl(2-methylthiapentalenyl)(2-isopropyl-4-(4′-tert-butylphenyl)indenyl)zirconiumdichloride

16.5 g (35 mmol) ofdimethylsilanediyl(2-methylthiapentalene)(2-isopropyl-4-(4′-tert-butylphenyl)indene)together with 150 ml of diethyl ether are placed in a reaction vesseland admixed at room temperature with 26.2 ml of butyllithium solution(2.68 M in toluene). After the addition is complete, the mixture isstirred overnight at this temperature. It is subsequently cooled to 0°C. and 8.2 g (35 mmol) of zirconium tetrachloride are added a little ata time. The mixture is allowed to warm to room temperature and isstirred for another 5 hours at this temperature. The precipitate formedis then separated off via a G3 frit and washed twice with 60 ml eachtime of THF and once with 80 ml of pentane. The residue is subsequentlydried in an oil pump vacuum. The complex is obtained in a yield of 8.8 g(40%).

1H-NMR (400 MHz, CDCl₃): pseudo-rac: 7.7-6.8 (m, 10H, arom-H), 6.6-6.5(m, 1H, H-thiapentalene), 3.23 (m, 1H, CH-isopropyl), 2.1 (m, 3H, CH₃),1.4 (s, 9H, tert-butyl), 1.5, 1.3 (each s, each 3H, Si—CH₃), 1.10, 1.05(each d, each 3H, isopropyl-CH₃). Pseudo-meso: 7.7-6.8 (m, 10H, arom-H),6.4-6.2 (m, 1H, H-thiapentalene), 3.35 (m, 1H, CH-isopropyl), 2.3 (m,3H, CH₃), 1.35 (s, 9H, tert-butyl), 1.2 (s, 6H, Si—CH₃), 1.15 (m, 6H,isopropyl-CH₃).

EXAMPLE 24 Preparation ofdimethylsilanediyl(2-isopropyl-4-(4′-tert-butylphenyl)indenyl)(2-methyl-4,5-benzoindenyl)zirconiumdichloride

7.9 g (15 mmol) ofdimethylsilanediyl(2-methyl-4,5-benzoindene)(2-isopropyl-4-(4′-tert-butylphenyl)-1-indene)together with 90 ml of diethyl ether are placed in a reaction vessel andadmixed at room temperature with 11.2 ml of butyllithium solution (2.68M in toluene). After the addition is complete, the mixture is stirredovernight at this temperature. It is subsequently cooled to 0° C. and3.53 g (15 mmol) of zirconium tetrachloride are added a little at atime. The mixture is allowed to warm to room temperature and is stirredfor another 4 hours at this temperature. The precipitate formed is thenseparated off via a G4 frit and washed twice with 60 ml each time ofTHF. The complex is recrystallized from a toluene/pentane mixture. Theresidue is subsequently dried in an oil pump vacuum. The complex isobtained in a yield of 3.1 g (30%).

1H-NMR (400 MHz, CDCl₃): pseudo-rac: 8.0-6.9 (m, 12H, arom-H), 3.15 (m,1H, CH-isopropyl), 2.25 (s, 3H, CH₃), 1.35 (s, 9H, tert-butyl), 1.36,1.35 (each s, each 3H, Si—CH₃), 1.09, 1.07 (each d, each 3H,isopropyl-CH₃). Pseudo-meso: 8.0-6.9 (m, 12H, arom-H), 3.39 (m, 1H,CH-isopropyl), 2.25 (s, 3H, CH₃, coincides with that of the rac form),1.35 (s, 9H, tert-butyl, coincides with that of the rac form), 1.37 (s,6H, Si—CH₃), 1.24 (m, 6H, isopropyl-CH₃).

EXAMPLE 25 Preparation ofdimethylsilanediyl(2-methyl-4-(4′-tert-butylphenyl)indenyl)(2-isopropyl-4-(1-naphthyl)indenyl)zirconiumdichloride

11.4 g (19 mmol) ofdimethylsilanediyl(2-isopropyl-4-(1-naphthyl)-1-indene)(2-methyl-4-(4′-tert-butylphenyl)-1-indene)together with 150 ml of toluene and 15 ml of THF are placed in areaction vessel and admixed at room temperature with 14.3 ml ofbutyllithium solution (2.68 M in toluene). After the addition iscomplete, the mixture is stirred overnight at this temperature. It issubsequently cooled to 0° C. and 4.4 g (19 mmol) of zirconiumtetrachloride are added a little at a time. The mixture is allowed towarm to room temperature and is stirred for another 2 hours at thistemperature. The precipitate formed is then separated off via a G4 fritand washed twice with 50 ml each time of THF. The residue issubsequently dried in an oil pump vacuum. The complex is obtained in ayield of 5.9 g (41%).

1H-NMR (400 MHz, CDCl₃): pseudo-rac: 7.8-6.95 (m, 17H, arom-H), 3.21 (m,1H, CH-isopropyl), 2.25 (s, 3H, CH₃), 1.33, 1.31 (each s, each 3H,Si—CH₃), 1.32 (s, 9H, tert-butyl), 1.09, 1.07 (each d, each 3H,CH₃-isopropyl). Pseudo-meso: 7.9-7.07 (m, 17H, arom-H), 3.37 (m, 1H,CH-isopropyl), 2.50 (s, 3H, CH₃), 1.35 (each s, each 3H, Si—CH₃), 1.32(s, 18H, tert-butyl, coincides with that of the rac form), 1.25 (m, 6H,CH₃-isopropyl).

EXAMPLE 26 Preparation ofdimethylsilanediyl(2-isopropyl-4-(4′-tert-butylphenyl)indenyl)(2-methyl-4-(1-naphthyl)indenyl)zirconiumdichloride

15.0 g (25 mmol) ofdimethylsilanediyl(2-methyl-4-(1-naphthyl)-1-indene)(2-isopropyl-4-(4′-tert-butylphenyl)-1-indene)together with 170 ml of toluene and 20 ml of THF are placed in areaction vessel and admixed at room temperature with 17.9 ml ofbutyllithium solution (2.68 M in toluene). After the addition iscomplete, the mixture is stirred overnight at this temperature. It issubsequently cooled to 0° C. and 5.9 g (25 mmol) of zirconiumtetrachloride are added a little at a time. The mixture is allowed towarm to room temperature and is stirred for another 2 hours at thistemperature. The precipitate formed is then separated off via a G4 fritand washed twice with 50 ml each time of THF and with 70 ml of pentane.The residue is subsequently dried in an oil pump vacuum. The complex isobtained in a yield of 6.8 g (41%).

1H-NMR (400 MHz, CDCl₃): pseudo-rac: 7.8-6.95 (m, 17H, arom-H), 3.22 (m,1H, CH-isopropyl), 2.23 (s, 3H, CH₃), 1.33, 1.31 (each s, each 3H,Si—CH₃), 1.32 (s, 9H, tert-butyl), 1.08, 1.06 (each d, each 3H,CH₃-isopropyl). Pseudo-meso: 7.9-7.05 (m, 17H, arom-H), 3.35 (m, 1H,CH-isopropyl), 2.48 (s, 3H, CH₃), 1.35 (each s, each 3H, Si—CH₃), 1.32(s, 18H, tert-butyl, coincides with that of the rac form), 1.22 (m, 6H,CH₃-isopropyl).

II Catalyst Preparation and Polymerization

Abbreviations

PP = Polypropylene MC = Metallocene Cat = supported catalyst system h =hour Standard dm³ = Standard liters rpm = Revolutions per minute VN =Viscosity number in cm³/g M_(w) = Weight average molar mass in g/molM_(w) /M_(n) = Molar mass distribution, determined by gel permeationchromatography BD = Bulk density in g/dm³ and M.p. = Melting point in °C., determined in accordance with ISO 3146 by differential scanningcalorimetry (DSC) at a heating and cooling rate of 10° C./min. TT =Triad tacticity in percent determined by ¹³C-NMR spectroscopy RI =Reverse insertions in %; determined in accordance with ISO 3146 by¹³C-NMR spectroscopyNMR Measurements

From 110 to 135 mg of the samples were weighed into 10 mm NMR tubes anddissolved at elevated temperature in a solvent mixture ofdideuterotetrachloroethane (C₂D₂Cl₄) and hexachlorobutadiene (C₄Cl₆).The NMR spectra of the solutions were recorded at 353 K (instrumentsetting) on a Bruker DMX 500 NMR spectrometer in accordance with SOP1030-038 (GLP), using a spinning sample, under the following conditions:

Radio frequency (BF1) 125.7577 MHz Pulse angle (P1) 30° Spectral width(SW) 250 ppm Acquisition time (AQ) 2.08 sec Delay time (D1) 1.92 secNumber of data points (TD) 131 072 Number of pulses (NS) >8000

The ¹³C-NMR measurements was carried out with broad-band decoupling ofthe protons.

Before Fourier transformation of the FIDs, an exponential multiplicationby a line broadening factor LB=1 Hz was carried out. After the Fouriertransformation, a linear baseline correction in the region of therelevant signals in the range from about 10 to 60 ppm was carried out.The chemical shifts were calibrated relative to the signal ofdideuterotetrachloroethane at 73.81 ppm.

In the integration of the propylene homopolymers, the followingconventions were employed: integration range for signals of the mmtriads: 22.55 ppm to 20.85 ppm; mr triads: 20.85 ppm to 20.0 ppm; rrtriads: 20.0 to 19.15 ppm; 2,1 insertion: 17.35 ppm to 16.75 ppm; 1,3insertion: sum of the integrals from 37 ppm to 36.5 ppm and from 30.7 to30.2 ppm. It is known that a single 2,1 insertion produces two signalsin the integration range, while regioregular insertions produce only onesignal. To convert the ratios of the mr triads to the 2,1 insertionsinto molar ratios, the values for the 2,1 insertions have to be dividedby two. In the case of the convention employed, on the other hand, theratios of the signals of the 2,1 insertions to the 1,3 insertions areidentical to the molar ratios.

It is also known that both 2,1 and 1,3 insertions each produce a furthersignal located in the integration range of the mr triads. Since thesignals in the integration range of the mr triads can sometimes not bedetected with separation on the baseline, the molar ratios cannot beobtained directly. To calculate the molar ratios of the mm triads to themr triads, the signal intensities of the reverse insertions firstly haveto be subtracted from the intensities observed for the mr triads.

In the evaluation of the spectra of propylene-ethylene copolymers, thecarbon atoms are numbered as follows:

-   —C¹H₂—CH(CH₃)—;-   —CH₂—CH(CH₃)—C⁵H₂—C⁷H₂—CH₂—CH(CH₃)—;    —CH₂—CH(CH₃)—C⁵H₂—C⁶H₂—C⁹H₂—CH₂—CH₂—CH(CH₃)—;-   —CH₂—CH(CH₃)—C⁵H₂—C⁶H₂—C⁹H₂—(C¹⁰H₂—CH₂)_(n)—CH₂—CH(CH₃)—;-   —CH₂—CH(CH₃)—C¹²H₂—C¹³H₂—CH₂—CH₂—CH(CH₃)—;-   —CH₂—CH(CH₃)—C¹⁶H₂—C¹⁵H₂—CH(CH₃)—C¹⁵H₂—C¹⁶H₂—CH(CH₃)—.

Both ends of the sequences shown are in each case adjoined by—CH₂—CH(CH₃)—. The assignment of the signals to the numbered carbonatoms is well known to those skilled in the art.

Coupled GPC—IR Measurements

GPC was carried out on a Waters 150C HT-GPC apparatus. The results werecalibrated using polystyrene. An interface model 300 from LabConnections, Marlborough, Mass. (USA) was employed for coupling. Here,the eluant is atomized in a vacuum chamber by means of an ultrasoundsignal and removed by heating and vacuum. The polymer which remains iscontinuously collected on a rotating germanium disk. This disk issubsequently scanned by means of an optic module in a Nicolet Impact400D FTIR spectrometer.

Conditions: GPC: eluant: trichlorobenzene, flow rate: 1.1 ml/min,injection volume: 150 μl, temperature: 150° C. Interface: nozzletemperature: 110° C., flow rate: 1.1 ml/min, Ge disk heating: 165° C.,transfer line: 145° C., rotation rate: 10°/min. FTIR: continuousrecording of spectra at 10°/min using Omnic standard software: 270spectra in 30 minutes (one spectrum every 8 seconds), each based on 16scans, detector: DTGS.

Evaluation was carried out using a method established by Dekmezian, ashas been published, for example, in the applications leaflet No. 16 fromLabConnections. Here, the ratio of the C—H stretching vibrations to theethylene content is calculated. A person skilled in the art will knowthat the constants in this ratio depend on the measurement conditionsemployed. They were determined by means of blending of linearpolyethylene (PE) and isotactic polypropylene. Analogous experimentalconditions were selected for this purpose (same GPC, same coupling, samerecording of spectra), but the GPC columns were not employed; rather,spraying was carried out directly from the injector onto the Ge plate sothat no demixing occurs. This calibration results in the followingformula:mol % of PE=39.7*ln[A(2922 cm−¹)+A(2850 cm−¹)/A(2953 cm−¹)]−9.2

In this formula, A is the peak height of the signal at the wave numberindicated in brackets.

Determination of Ether-soluble Material

About 5 g of polymer are extracted with 280 ml of peroxide-free diethylether (stabilized with 0.1% of Irganox 1010, 1 g of stabilizer/l ofether) under reflux in a 1 l round-bottom flask for 4 hours. Theundissolved material is separated off and the solution is evaporated toabout 50 ml. The dissolved material is precipitated by addition of alarge excess [lacuna], aggregated by stirring using a magnetic stirrerand isolated by filtration on a glass filter crucible D1 (diameter: 30mm).

EXAMPLE 27 Preparation of the Supported Catalyst System

70 mg (0.091 mmol) ofrac-dimethylsilanediyl(2-methyl-4-(para-tert-butylphenyl)indenyl)(2-isopropyl-4-(para-tert-butylphenyl)indenyl)zirconiumdichloride (Example 18) were dissolved at room temperature in 4.3 cm³(20 mmol of Al) of 30% strength methylaluminoxane solution in toluene(Albemarle Corporation, Baton Rouge, La., USA). The solution was dilutedwith 3.7 cm³ of toluene and stirred at 25° C. for 1 hour while beingprotected from light. This solution was added a little at a time whilestirring to 4 g of SiO₂ (grade MS 948, W. R. Grace, Davison ChemicalDivision, Baltimore, Md., USA, pore volume: 1.6 ml/g, calcined at 600°C.) and, after the addition was complete, the mixture was stirred foranother 10 minutes. The ratio of the volume of solution to the totalpore volume of the support material was 1.25. The mixture wassubsequently dried for 4 hours at 40° C. and 10⁻³ mbar. This gave 5.5 gof a free-flowing powder which, according to elemental analysis,contained 0.13% by weight of Zr and 9.5% by weight of Al.

Polymerization:

A dry 16 dm³ reactor which had been flushed firstly with nitrogen andsubsequently with propene was charged with 10 dm³ of liquid propene. 8cm³ of 20% strength triethylaluminum solution in Varsol (Witco) wereadded as scavenger and the mixture was stirred for 15 minutes at 30° C.A suspension of 2 g of the supported metallocene catalyst in 20 cm³ ofExxsol was subsequently introduced into the reactor, the reactionmixture was heated to the polymerization temperature of 70° C. and thepolymerization system was maintained at 70° C. for 1 hour. Thepolymerization was stopped by venting and the polymer obtained was driedunder reduced pressure. This gave 2.7 kg of polypropylene powder.

The catalyst activity was 123 kg of PP/(g of MC×h) or 1.4 kg of PP/(g ofCat×h)

The isotactic polypropylene prepared had the following properties:M.p.=157° C.; M_(w)=4.5×10⁵ g/mol, M_(w)/M_(n)=2.6, VN=430 cm³/g, BD=460g/dm³, TT=>99% , RI=0.32%.

EXAMPLES 28 TO 34 Preparation of the Supported Catalyst System

The procedure of Example 27 was repeated using further metallocenes.

The results are summarized in the following table.

Weight of Zr Al metall- content content Ex. ocene [% by [% by no.Metallocene used [mg] weight] weight] 28 Dimethylsilanediyl(2-ethyl-4-E19 71.3 0.16 9.5 (4′-tert-butylphenyl)indenyl)-(2-isopropyl-4-(4′-tert-butyl- phenyl)indenyl)zirconium dichloride 29Dimethylsilanediyl(2-methyl- E20 64.8 0.15 9.54-(4′-tert-butylphenyl)in- denyl)-(2-isopropyl-4-phenyl-indenyl)-zirconium dichloride 30 Dimethylsilanediyl(2-methyl- E21 64.80.14 9.5 4-phenyl)-1-indenyl) (2-iso- propyl-4-(4′-tert-butylphenyl)-1-indenyl)zirconium dichloride 31 Dimethylsilanediyl(2-ethyl-4- E22 66.10.14 9.5 (4′-tert-butylphenyl)indenyl)- (2-isopropyl-4-phenylin-denyl)-zirconium dichloride 32 Dimethylsilanediyl(2-iso- E24 62.5 0.139.5 propyl-4-(4′-tert-butylphenyl)- indenyl) (2-methyl-4,5-benzo-indenyl)zirconium dichloride 33 Dimethylsilanediyl(2-methyl- E25 69.40.16 9.5 4-(4′-tert-butylphenyl)in- denyl)-(2-isopropyl-4-(1-naphthyl)-indenyl) zirconium dichloride 34 Preparation ofdimethylsilane- E26 69.3 0.13 9.5 diyl(2-isopropyl-4-(4′-tert-butylphenyl)-indenyl) (2- methyl-4-(1-naphthyl)in- denyl)zirconiumdichloridePolymerization:

The procedure of Example 27 was repeated using further catalysts.

The results are listed in the following table.

Yield Activity [kg Ex. Metallo- of PP of PP/g of no. cene no. [kg] Cat *h] M.p. M_(w) M_(w)/M_(n) BD 28 E19 2.1 1.1 157 515000 3.1 450 29 E202.3 1.2 156 433000 2.8 430 30 E21 2.6 1.3 156 365000 2.7 420 31 E22 2.41.2 156 467000 2.6 440 32 E24 2.1 1.1 156 376000 2.3 450 33 E25 2.6 1.3157 569000 2.5 455 34 E26 2.4 1.2 158 589000 2.3 435

EXAMPLE 35

The polymerization was carried out using a method analogous to Example27, but additionally using 5 standard dm³ of hydrogen in thepolymerization. This gave 3.2 kg of polypropylene powder.

The catalyst activity was 146 kg of PP/(g of MC×h) or 1.6 kg of PP/(g ofCat×h).

The isotactic polypropylene prepared had the following properties:M.p.=159° C.; M_(w)−2.5×10⁵ g/mol, M_(w)/M_(n)=3.0, VN=270 cm³/g, BD=450g/dm³, TT>99%, RI=0.3%.

EXAMPLES 36 TO 40a (COMPARATIVE EXAMPLES) 1 Preparation of the SupportedCatalyst System

The preparation was carried out using a method analogous to Examples 27to 34. The results are summarized in the following table.

Zr Weight content Al content Ex. used [% by [% by no. Metallocene [mg]weight] weight] 36 Dimethylsilanediylbis- 67.4 0.16 9.5(2-methyl-4-(4′-tert- butylphenyl)indenyl)- zirconium dichloride 37Dimethylsilanediyl- 59.7 0.14 9.5 (2-methyl-4-phenyl)-indenyl)(2-isopropyl-4- phenyl)indenyl)zirconium dichloride 38Dimethylsilanediyl- 64.1 0.16 9.5 (2-methyl-4-(1-naph-thyl)indenyl(2-isopropyl- 4-phenyl)indenyl)- zirconium dichloride 39Dimethylsilanediyl- 54.9 0.16 9.5 (2-methyl-4-phenyl-indenyl)(2-methyl-4,5- benzoindenyl)zirconium dichloride 40Dimethylsilanediyl- 64.1 0.16 9.5 (2-methyl-4-(1-naphth-yl)indenyl)(2-methyl-4- phenylindenyl)zirconium dichloride 40aDimethylsilanediylbis- 1.7 0.15 9.4 (2-methyl-4-(1-naph-thyl)indenyl)zirconium dichloridePolymerization:

The polymerizations were carried out using a method analogous toExamples 27 to 34. The results are summarized in the following table.

Weight of Ex. PP obtained Activity M_(w)/ no. Metallocene [kg][kg/(gxh)] M.p. M_(w) M_(n) BD 36Dimethylsilanediylbis-(2-methyl-4-(4′-tert- 3.2 1.6 154 900000 2.6 460butylphenyl)indenyl)-zirconium dichloride 37Dimethylsilanediyl-(2-methyl-4-phenyl-indenyl) 1.1 0.6 152 322000 3.1450 (2-isopropyl-4-phenylindenyl)-zirconium dichloride 38Dimethylsilanediyl-(2-methyl-4-(1-naphthyl)indenyl) 1.3 0.7 153 3900002.9 435 (2-isopropyl-4-phenylindenyl)zirconium dichloride 39Dimethylsilanediyl-(2-methyl-4-phenyl-indenyl) 1.6 0.8 149 340000 2.5450 (2-methyl-4,5-benzoindenyl)zirconium dichloride 40Dimethylsilanediyl-(2-methyl-4-(1-naphthyl)indenyl) 1.7 0.9 150 3600002.6 460 (2-methyl-4-phenylindenyl)-zirconium dichloride

TABLE Metallo- Weight of Activity C2 con- cene from PP [kg of tent [%Ex. Example obtained PP/(g of by no. no.: Monomers [kg] Cat *h)] M.p.M_(w) M_(w)/M_(n) weight) 41 E18 12 1 of propene / 150 g of ethene 2.423.5 141 522000 2.3  6.1 42 E19 12 1 of propene / 150 g of ethene 2.5 3.6142 688000 3.1 6.5 43 E20 12 1 of propene / 150 g of ethene 2.6 3.7 140578000 2.8 5.8 44 E21 12 1 of propene / 150 g of ethene 2.4 3.4 141555000 2.7 5.9 45 E22 12 1 of propene / 150 g of ethene 2.1 3.0 142589000 2.6 6 46 E24 12 1 of propene / 150 g of ethene 2.6 3.7 141 5690002.3 5.8 47 E25 12 1 of propene / 150 g of ethene 2.7 3.9 142 621000 2.56.3 48 E26 12 1 of propene / 150 g of ethene 2.6 3.7 142 643000 2.3 6.749 E18 12 1 of propene / 450 g of ethene 2.52 3.6 115 592000 2.5 18.1 50E19 12 1 of propene / 450 g of ethene 2.62 3.7 116 699000 3.1 18.5 51E20 12 1 of propene / 450 g of ethene 2.74 3.9 114 589000 2.5 16 52 E2112 1 of propene / 450 g of ethene 2.54 3.6 113 576000 2.8 17.1 53 E22 121 of propene / 450 g of ethene 2.5 3.6 115 599000 2.5 16.5 54 E24 12 1of propene / 450 g of ethene 2.65 3.8 113 589000 2.4 18.2 55 E25 12 1 ofpropene / 450 g of ethene 2.8 4.0 117 643000 2.7 19.9 56 E26 12 1 ofpropene / 450 g of ethene 2.76 3.9 118 651000 2.6 19.8

EXAMPLES 41 TO 56

A dry 24 dm³ reactor was flushed with propylene and charged with 12 dm³of liquid propylene, 150 g of ethylene (Examples 41 to 48) or 450 g ofethylene (Examples 49 to 56) and 22 cm³ of a solution oftriisobutylaluminum in hexane (8 mmol of Al, 2 cm³ oftriisobutylaluminum diluted with 20 cm³ of hexane), and the reactorstirrer was set to 250 rpm. 0.7 g of the supported catalyst prepared inExamples 27 to 34 was suspended in 25 cm³ of a dearomatized petroleumfraction having a boiling range or 100-120_C. and the suspension wasintroduced into the reactor. The reactor was heated to thepolymerization temperature of 70_C. (7.5_C./min) and maintained at thispolymerization temperature for 1 hour by cooling the reactor jacket. Thepolymerization was stopped by quickly venting the excess monomers. Thepolymer was dried under reduced pressure. Polymer yield, catalystactivity and product data are shown in the following table.

EXAMPLES 57 TO 68 (COMPARATIVE EXAMPLES)

The procedure of Examples 41 to 56 was repeated. The results are shownin the following table. When using the catalyst system which is notaccording to the present invention, the molar mass M_(w) dropssignificantly below the value obtained in the homopolymerizations inExamples 36 to 40.

TABLE Weight Activity C2 Metallocene of PP [kg of content Ex. fromobtained PP/(g of [% by no. Example no.: Monomers [kg] Cat * h)] M.p.M_(w) M_(w)/M_(n) weight] 57 36 12 l of propene/150 g of ethene 2.24 3.2140 815000 2.2 3 58 36 12 l of propene/450 g of ethene 2.38 3.4 109586000 2.4 10.6 59   40a 12 l of propene/150 g of ethene 1.19 1.7 133509000 2.3 3 60   40a 12 l of propene/450 g of ethene 1.26 1.8 106464000 2.8 10.5 61 37 12 l of propene/450 g of ethene 1.8 2.6 108 1490002.4 11 62 37 12 l of propene/150 g of ethene 1.6 2.3 138 210000 2.2 3.563 38 12 l of propene/450 g of ethene 1.9 2.7 107 256000 2.4 10.9 64 3812 l of propene/150 g of ethene 1.6 2.3 141 305000 2.2 3.1 65 39 12 l ofpropene/450 g of ethene 1.7 2.4 108 215000 2.4 10.2 66 39 12 l ofpropene/150 g of ethene 1.5 2.1 140 280000 2.2 3.2 67 40 12 l ofpropene/450 g of ethene 1.8 2.6 109 223000 2.4 11.1 68 40 12 l ofpropene/150 g of ethene 1.6 2.3 138 289000 2.2 3.1

EXAMPLES 69 TO 76 Preparation of the Supported Catalyst System

0.5 ml of N,N-dimethylaniline is added at room temperature to asuspension of 2 g of SiO₂ (see Example 27) in 30 ml of toluene. Themixture is cooled to 0° C. and 40 ml of a clear, light-yellow solution(0.1M based on Al) of bis(pentafluorophenylboroxy)methylalane in 95 mlof toluene are added dropwise from a dropping funnel. The mixture isallowed to warm to room temperature and is stirred for another 3 hours.The suspension is subsequently filtered and the solid is washed withpentane. The residue is then dried to constant weight in an oil pumpvacuum. This gives 3.96 g of a pale purple support material.

0.06 mmol of metallocene in 35 ml of toluene are stirred with 0.08 ml ofTMA (2M in toluene, 0.16 mmol) for 10 minutes. Subsequently, 1.6 g ofthe supported cocatalyst prepared above are added at room temperature.The catalyst solution is stirred for 1 hour and the solvent is thentaken off in an oil pump vacuum. This gives a pink, free-flowing powder.

Weight of metallocene used Ex. no. Metallocene from Example no.: [mg] 69E18 46.1 70 E19 47.0 71 E20 42.7 72 E21 42.7 73 E22 43.6 74 E24 41.2 75E25 45.8 76 E26 45.7Polymerization:

The polymerization was carried out using a method analogous to Example27. The results are shown in the following table.

TABLE Calculated Weight Activity Metallocene weight of of PP [kg of Ex.from catalyst obtained PP/(g of no. Example no.: used [kg] Cat * h)]M.p. M_(w) M_(w)/M_(n) BD 69 E18 0.80 2.5 3.1 158 450000 2.3 410 70 E190.80 2.1 2.6 158 515000 2.7 450 71 E20 0.80 2 2.5 158 433000 2.8 430 72E21 0.80 2.2 2.8 157 365000 2.6 440 73 E22 0.80 2.4 3.0 156 467000 2.4420 74 E24 0.80 2.5 3.1 157 376000 2.3 430 75 E25 0.80 2.3 2.9 158569000 2.3 450 76 E26 0.80 2.2 2.8 159 589000 2.5 450

EXAMPLE 77

The polymerization was carried out using a method analogous to Example69, but only 0.4 g of catalyst were used and, in addition, 5 standarddm³ of hydrogen were used in the polymerization. This gave 3.2 kg ofpolypropylene powder.

The catalyst activity was 8 kg of PP/(g of Cat×h).

The isotactic polypropylene prepared had the following properties:M.p.=160° C.; M_(w)=250000 g/mol, M_(w)/M_(n)=2.6, BD=420 g/dm³.

EXAMPLE 78

A dry 24 dm³ reactor was flushed with propylene and placed under ahydrogen pressure of 0.5 bar. The reactor was subsequently charged with12 dm³ of liquid propylene and 22 cm³ of a solution oftriisobutylaluminum in hexane (8 mmol of Al, 2 cm³ oftriisobutylaluminum diluted with with 20 cm³ of hexane) and the reactorstirrer was set to 250 rpm. 0.7 g of the supported catalyst prepared inExample 27 was suspended in 25 cm³ of a dearomatized petroleum fractionhaving a boiling range of 100-120° C. and the suspension was introducedinto the reactor. The reactor was heated to the polymerizationtemperature of 70° C. (7.5° C./min) and maintained at thispolymerization temperature for 1 hour by cooling the reactor jacket.

The reactor was subsequently depressurized to 10 bar and pressurizedwith 20 bar of ethylene. The mixture was polymerized further for 2 hoursat 60° C. and the polymerization was then stopped by quickly venting theexcess monomers. This gave a block copolymer having the followingproperties:

Homopolymer matrix (iPP from fractionation): M.p.=159° C.; M_(w)=2.6×10⁵g/mol; M_(w)/M_(n)=2.5, VN=240 cm³/g. Rubber (ethylene-propylenecopolymer): T_(g)=−47° C.; 56% by weight of C₂; VN=680 cm³/g;M_(w)=6.9×10⁵ g/mol; M_(w)/M_(n)=3.0.

EXAMPLE 79 (COMPARATIVE EXAMPLE)

Example 78 was repeated using a supported catalyst prepared as describedin Example 36. This gave a block copolymer having the followingproperties:

Homopolymer matrix (iPP from fractionation): M.p.=155° C.; M_(w)=2.8×10⁵g/mol; M_(w)/M_(n)=2.6, VN=230 cm³/g. Rubber (ethylene-propylenecopolymer): T_(g)=−49° C.; 44% by weight of C₂; VN=374 cm³/g;M_(w)=4.03×10⁵ g/mol; M_(w)/M_(n)=3.0.

Comparative Example 80

Example 78 was repeated using a supported catalyst containingdimethylsilanediylbis(2-methyl-4-(1-naphthyl)indenyl)zirconiumdichloride as metallocene. This gave a block copolymer having thefollowing properties:

Homopolymer matrix (iPP from fractionation): M.p.=154° C.;M_(w)=1.99×10⁵ g/mol; M_(w)/M_(n)=2.6; VN=168 cm³/g. Rubber(ethylene-propylene copolymer): T_(g)=−50° C.; 46% by weight of C₂;VN=280 cm³/g; M_(w)=3.54×10⁵ g/mol; M_(w)/M_(n)=2.7.

EXAMPLE 81

Example 78 was repeated, except that the reactor was charged with only10 dm³ of liquid propylene and the catalyst was introduced as a paste.For this purpose, 20 g of the catalyst prepared in Example 27 werestirred into 100 ml of an oil (white oil Ondina G 33, Deutsche ShellAG)/Vaseline (Deutsche Shell AG) mixture (4/1). An aliquot of theresulting paste corresponding to 0.7 g of catalyst powder was introducedinto a pressure lock and rinsed into the reactor using 2 dm³ of liquidpropylene.

This gave a block copolymer having properties comparable to those inExample 78.

EXAMPLE 82

Example 78 was repeated, except that the first polymerization stage wascarried out at 65° C. in the presence of 60 g of ethylene. This gave ablock copolymer having the following properties:

Homopolymer matrix (iPP from fractionation): M.p.=158° C.; M_(w)=2.5×10⁵g/mol; M_(w)/M_(n)=2.5; VN=260 cm³/g. Rubber (ethylene-propylenecopolymer): T_(g)=−26° C.; 14% by weight of C₂; VN=576 cm³/g;M_(w)=6.02×10⁵ g/mol; M_(w)/M_(n)=2.8.

High molecular weight copolymers with olefins higher than ethylene canalso be prepared using the metallocenes of the present invention. Someexamples are presented below to illustrate the principle:

EXAMPLE 83

Example 27 was repeated, except that the reactor was depressurized to 18bar and then pressurized with only 5 bar of ethylene prior to the secondpolymerization step. This gave a block copolymer which suffered fromlittle stress whitening and had the following properties:

Homopolymer matrix (iPP from fractionation): M.p.=150° C.;M_(w)=3.35×10⁵ g/mol; M_(w)/M_(n)=2.7; VN=315 cm³/g. Rubber(ethylene-propylene copolymer): T_(g)=−52° C.; 47% by weight of C₂;VN=295 cm³/g; M_(w)=3.43×10⁵ g/mol; M_(w)/M_(n)=2.8.

EXAMPLES 84 TO 86

A dry 24 dm³ reactor was flushed with propylene and charged with 12 dm³of liquid propylene and 22 cm³ of a solution of triisobutylaluminum inhexane (8 mmol of Al, 2 cm³ of triisobutylaluminum diluted with 20 cm³of hexane), and the reactor stirrer was set to 250 rpm. After additionof a third of the total 9.62 mol of comonomer intended for thepolymerization, 0.7 g of the catalyst prepared in Example 27, suspendedin 25 cm³ of a dearomatized petroleum fraction having a boiling range of100-120° C., was introduced into the reactor. The reactor was heated tothe polymerization temperature of 65° C. (7.5° C./min) and maintained atthis polymerization temperature for 1 hour by cooling the reactorjacket. During this polymerization time, the remaining two thirds of thecomonomer were metered continuously into the reactor. The polymerizationwas stopped by quickly venting the excess monomers. The polymer wasdried under reduced pressure. Polymer yield, metallocene activities andproduct data are shown in the table below.

EXAMPLES 87 TO 89 (COMPARATIVE EXAMPLES)

Examples 84 to 86 were repeated using a catalyst prepared fromdimethylsilanediylbis(2-methyl-4-(1-naphthyl)indenyl)zirconiumdichloride as metallocene. Polymer yield, metallocene activities andproduct data are shown in the following table.

Activity Comonomer Yield [kg of [kg/ M.p. VN content [% Ex. Comonomercopolymer] (g × h)] [° C.] [cm³/g] by weight] 84 1-Butene 2.40 3.43 132546 4.8 85 4-Methyl-1- 1.55 2.21 122 536 3.5 pentene 86 1-Hexene 2.874.10 108 606 6.1 87 1-Butene 1.16 1.65 n.d. 452 2.4 88 4-Methyl-1- 0.811.15 n.d. 437 2.6 pentene 89 1-Hexene 1.44 2.06 n.d. 490 3.0

High molecular weight terpolymers can also be prepared using thecatalysts of the present invention. Some examples are presented below toillustrate the principle:

EXAMPLES 90 TO 93

A dry 24 dm³ reactor was charged with 10 l of a dearomatized petroleumfraction having a boiling range of 100-120° C. The gas space was thenflushed by pressurizing the reactor five times with 2 bar of propyleneand venting it each time. After addition of 2000 g of propylene, 300 gof ethylene and, if required for the particular example, 100 g of afurther monomer (see Table 3), 10 cm³ of methylaluminoxane solution intoluene (corresponding to 15 mmol of Al, molar mass determined bycryoscopy=1200 g/mol) were added. The contents of the reactor wereheated to 60° C. 2.1 mg ofrac-dimethylsilanediyl(2-methyl-4-(para-tert-butylphenyl)indenyl)(2-isopropyl-4-(para-tert-butylphenyl)indenyl)zirconiumdichloride were dissolved in 10 cm³ of the methylaluminoxane solution intoluene (corresponding to 15 mmol of Al) and likewise introduced intothe reactor. During the polymerization time of 2 hours, a further 300 gof ethylene were metered in. The polymerization was stopped by quicklyventing the excess monomers. The polymer was separated from thepetroleum spirit and dried under reduced pressure at 100° C. Polymeryields, metallocene activities and product data are shown in the tablebelow.

EXAMPLES 94 TO 97 (COMPARATIVE EXAMPLES)

Examples 90 to 93 were repeated using 2.0 mg ofdimethylsilanediylbis(2-methyl-4-(1-naphthyl)indenyl)zirconiumdichloride. Polymer yields, metallocene activities and product data areshown in the following table.

Yield Activity VN C₂ Comonomer Further [kg of co- [kg/ [cm³/ content [%content [% Ex. monomer polymer] (g × h)] g] by weight] by weight] 90 —2.01 479 595 52.2 — 91 1-Butene 1.80 429 426 44.7 4.5 92 4-Methyl-1-1.02 243 444 48.3 4.0 pentene 93 1-Hexene 1.78 424 463 46.9 4.1 94 —1.54 385 405 45.0 — 95 1-Butene 1.22 305 349 40.8 3.0 96 4-Methyl-1-1.34 336 328 44.0 2.3 pentene 97 1-Hexene 1.52 380 400 42.6 3.2

EXAMPLES 98 TO 102 High-impact Copolymers by Gas-phase Polymerization

A: Preparation of the Metallocene Catalyst

3 kg of Sylopol 948 are placed in a process filter whose filter platepoints downward, and suspended in 15 l of toluene. 7 l of a 30% strengthby weight MAO solution (from Albemarle) are metered in while stirring atsuch a rate that the internal temperature does not exceed 35° C. Afterstirring for another 1 hour at a low stirrer speed, the suspension isfiltered, firstly under atmospheric pressure and then using 3 bar ofnitrogen pressure. In parallel to the treatment of the support material,2.0 l of 30% strength by weight MAO solution and 92.3 g ofrac-dimethylsilyl(2-methyl-4-(para-tert-butylphenyl)indenyl)(2-isopropyl-4-(para-tert-butyl-phenyl)indenyl)zirconiumdichloride are placed in a reaction vessel, the solution is stirred for1 hour and allowed to settle for a further 30 minutes. The solution issubsequently added to the pretreated support material with the outletclosed. After addition is complete, the outlet is opened and thefiltrate is allowed to drain. When no more runs off, the outlet isclosed, the filter cake is stirred for 15 minutes and allowed to restfor 1 hour. A nitrogen pressure of 3 bar is subsequently applied withthe outlet open. 15 l of isododecane are added to the remaining solid,the mixture is stirred for 15 minutes and filtered. The washing step isrepeated, and the solid is subsequently pressed dry by means of anitrogen pressure of 3 bar. For use in the polymerization, the totalamount of the catalyst is resuspended in 15 l of isododecane.

B: Polymerization

The process was carried out in two stirring autoclaves connected inseries, each provided with a free-standing helical stirrer and eachhaving a utilizable capacity of 200 l. Both reactors contained anagitated fixed bed of finely divided propylene polymer.

The propylene was introduced in gaseous form into the firstpolymerization reactor and polymerized at a mean residence time as shownin Table 1 with the aid of the metallocene catalyst A (see above) at apressure and temperature as shown in Table 1. The above-describedmetallocene catalyst was metered in at such a rate that the transferfrom the first polymerization reactor to the second polymerizationreactor corresponds, on average, to the amounts of polymer shown inTable 1. The metallocene catalyst was introduced together with the freshpropylene added to regulate the pressure. Triethylaluminum (in the formof a 1 molar solution in heptane, in an amount corresponding to Table 1)was likewise metered into the reactor. Polymer powder was takenintermittently from the reactor by briefly venting the reactor via animmersed tube. The propylene polymer formed in the first reactortogether with the catalyst and together with unreacted monomers was thusintroduced into the second reactor.

There, a mixture of propylene and ethylene was polymerized onto it at atotal pressure, a temperature and a mean residence time corresponding toTable 1. The proportion of ethylene was the percentage by volumeindicated in Table 1; the ethylene concentration in the reaction gas wasdetermined by gas chromatography. The weight ratio of the propylenepolymer formed in the first reactor (PP(I)) to the copolymer formed inthe second reactor (EPR(II)) is shown in Table 1. Isopropanol (in theform of a 0.5 molar solution in heptane) was likewise metered into thesecond reactor. The isopropanol was metered-in in such an amount thatthe weight ratio of PP(I): EPR(II) shown in Table 1 was maintained.

The analytical experiments on the polymer powders and their constituentsare shown in Table 2:

TABLE 1 Polymerization conditions Ex. Ex. Ex. Ex. Ex. 98 99 100 101 102Reactor I Pressure [bar] 28 29 29 26 26 Temperature [° C.] 75 75 75 7070 Triethylaluminum 60 60 60 90 90 (1 molar in heptane) [ml/h] Residencetime [h] 2.25 2.25 2.25 1.5 1.5 MFR of powder [dg/min] (ISO 1133) 11.09.8 9.2 10.0 9.8 Powder output [kg/h] 20 20 20 30 30 Reactor II Pressure[bar] 15 15 15 15 15 Temperature [° C.] 65 65 65 65 65 Ethylene [% byvol.] 30 41 49 28 33 Residence time [h] 1.7 1.7 1.7 1.0 1.2 Powderoutput [kg/h] 24.1 24.2 24.3 39.2 37.7 MFR of powder [dg/min] (ISO 1133)10.7 8.7 5.5 9.5 10.4 Weight ratio of PP (I):EPR (II) 4.9 4.8 4.7 3.33.9

TABLE 2 Analysis of the copolymer powders: Ex. 98 Ex. 99 Ex. 100 Ex. 101Ex. 102 Homopolymer content [% by wt.] 80 79 79 71 76 (Prepared inreactor I) Copolymer content [% by wt.] 20 21 21 29 24 (Prepared inreactor II) C2 content of copolymer fraction 7.5 23.3 40.0 6.5 22.5 [%by wt.] (IR determination) Viscosity number (ISO 1628) [cm3/g]Homopolymer fraction 175 164 185 160 162 Copolymer fraction 152 157 191168 160 Glass transition temperatures [° C.] −6 2/−42 2/−56 −4 −5 (DMAmeasurement) GPC measurements Molar mass M_(n) [g/mol] 101000 95000105900 105500 100600 Molar mass distribution M_(w)/M_(n) 2.1 2.1 2.0 2.12.0

Determination of analytical data on product fractions: Fractionation ofthe polymer by means of TREF (as described by L. Wild, “Temperaturerising elution fractionation”, Advanced Polym. Sci. 98, 1-47 (1990).Fractions were eluted with xylene at 40, 80, 90, 100 and 120° C. andassigned correspondingly to the homopolymer fraction (prepared inreactor I) or the copolymer fraction (prepared in reactor II).

Granulation of the Polymer Powders:

The dried polymer powders were intimately mixed with a standard additivemixture (addition of 0.05% by weight of Irganox 1010, 0.05% by weight ofIrgafos 168, 0.1% by weight of calcium stearate and 0.2% by weight ofMillad 3988). The resultant powders were extruded on a Werner &Pfleiderer ZSK 30 twin-screw extruder at a melt temperature of 250° C.and subsequently granulated in a granulator. The production of the testspecimens required for the applications-related tests and the teststhemselves were carried out in accordance with the standards indicatedin Table 3.

TABLE 3 Applications-related testing of the granulated polymers Test Ex.Ex. Ex. Ex. Ex. method 98 99 100 101 102 MFR (230° C./ ISO 12.3 8.7 6.911.0 12.6 2.16 kg) 1133 [dg/min] Hexane extract FDA 0.9 0.4 0.2 0.6 0.5[%] E modulus ISO 527 1156 1006 1093 1120 1020 [MPa] Charpy impact ISOno no no no no toughness 179-2/1 frac- frac- frac- frac- frac- (23° C.)eU ture ture ture ture ture [kJ/m²] Charpy impact ISO 163 no no 160 notoughness 179-2/1 frac- frac- frac- (0° C.) [kJ/m²] eU ture ture tureCharpy impact ISO 28 180 130 26 123 toughness 179-2/1 (−20° C.) eU[kJ/m²] Heat distortion ISO 81 76 78 80 79 resistance 75-2 HDT B [° C.]Method B Softening ISO 306 141 139 140 140 141 temperature VST/ Vicat A[° C.] A50 DSC melting ISO 156 157 157 156 156 point [° C.] 3146 Haze[%] ASTM 10 20 17 8 9 D 1003 Examples 103 to 109: Homopolymers andrandom copolymers of propylene and their propertiesProduction of CatalystsCatalyst Al:

Work is initially carried out under an argon atmosphere in a glove box.319.3 mg of the complexrac-dimethylsilyl(2-methyl-4-(para-tert-butylphenyl)indenyl)(2-isopropyl-4-(para-tert-butylphenyl)indenyl)zirconiumdichloride are dissolved in a mixture of 18.4 ml of 30% strength byweight MAO solution (from Albemarle) and 22 ml of toluene. Afterstirring for 1 hour at room temperature, the solution is clear and isadded to 20.16 g of silica gel Sylopol 948 from Grace Davison (d₅₀−50μm; dried for 8 hours at 300° C. in a stream of nitrogen). After all ofthe solution has been added, the mixture is stirred for another 10minutes and the paste-like mass is transferred to a Schlenk vessel (N2flask).

Outside the glove box, the volatile constituents are removed on a vacuumline equipped with an oil pump using an oil bath heated to 40° C., untilapproximately constant weight is achieved after about 4 hours. Theresidual content of volatile constituents is determined on aMettler-Toledo moisture analyzer and is 2.05%.

Comparative Catalyst B:

The catalyst preparation of experiment $ [sic] is repeated using 155.1mg of the complexrac-dimethylsilylbis(2-methyl-4-(para-tert-butylphenyl)indenyl)zirconiumdichloride, 9.3 ml of 30% strength by weight MAO solution and 10.17 g ofsilica gel. The residual moisture is 2.3%.

Comparative Catalyst C:

4 kg of silica gel Sylopol 948 from Grace Davison (d₅₀=50 μm; dried for8 hours at 300° C. in a stream of nitrogen) are placed in a processfilter, 18 l of heptane are introduced and the contents of the reactorare cooled to an internal temperature of 20° C. 6 l of a 2 molarsolution of triisobutylaluminum in heptane are added over a period ofabout 30 minutes at such a rate that the internal temperature does notexceed 30° C. After the addition of the alkyl, the cryostat is switchedoff and the mixture is stirred further for about 2 hours at a very lowstirrer speed. The suspension is filtered using nitrogen pressure, thefilter cake is washed three times with 12 l each time of toluene. Thesolid is resuspended in 11 l of toluene and 291 g ofdimethylcyclohexylammonium tetrakis(pentafluorophenyl)borate are addedto the suspension. The mixture is subsequently heated to an internaltemperature of 80° C. and stirred at this temperature for 30 minutes.The complex rac-dimethylsilylbis(2-methyl-4-phenyl-indenyl)zirconiumdichloride is then added and the mixture is stirred for another 1.5hours at 80° C. The catalyst is then dried under reduced pressure (about40 mbar) at an internal temperature of about 80° C.

Homopolymerizations

Experiment 103

A dry 16 dm³ reactor which had been flushed firstly with nitrogen andsubsequently with propene was charged with 10 dm³ of liquid propene. 8cm³ of 20% strength by weight triethylaluminum solution in Varsol(Witco) were added as scavenger and the mixture was stirred for 15minutes at 30° C. A suspension of 1.5 g of the catalyst Al in 20 cm³ ofExxsol was subsequently introduced into the reactor, the mixture washeated to the polymerization temperature of 65° C. and thepolymerization system was held at this temperature for 1 hour. Thepolymerization was stopped by venting and the polymer obtained was driedunder reduced pressure. This gave 2.05 kg of polypropylene powder.M_(w): 260 000 g/mol; M_(w)/M_(n): 3.6. ¹³C-NMR spectrum: ratio of thesignal intensities of mm triads/mr triads/rr triads: 96.0/2.9/1.1. Ratioof mm triads/2,1 insertions: 1230/10. Ratio of 2,1 insertions/1,3insertions: 3/1.

Comparative Experiment 104

The polymerization of Experiment @ [sic] was repeated using 1.1 gpowder. M_(w): 514 000 g/mol; M_(w)/M_(n): 3.3. ¹³C-NMR spectrum: ratioof the signal intensitities of mm triads/mr triads/rr triads:97.6/2.0/0.4. Ratio of mm triads/2,1 insertions: 485/10.

Comparative Example 105

The polymerization of Experiment @ [sic] was repeated using 38.8 cm³ of20% strength by weight diisobutylaluminum solution in Varsol (Witco) asscavenger. 630 mg of the comparative catalyst C were added. Immediatelyafter the catalyst, 63 mg of Atmer were introduced. This gave 2.59 kg ofpolypropylene powder. M_(w): 350 000 g/mol; M_(w)/M_(n): 3.4. ¹³C-NMRspectrum: Ratio of the signal intensities of mm triads/mr triads/rrtriads: 98.3/1.3/0.4. Ratio of mm triads/2,1 insertions: 1100/10.

Copolymerizations

Experiment 106

A dry 5 dm³ reactor which had been flushed firstly with nitrogen andsubsequently with propene was charged with 3 dm³ of liquid propene.Ethylene was subsequently introduced until a pressure increase of 500 Pahad been established at 30° C. 2.3 cm³ of 20% strength by weighttriethylaluminum solution in Varsol (Witco) were added as scavenger, themixture was stirred for 15 minutes and subsequently heated to 65° C. Asuspension of 250 mg of the catalyst Al in 6 cm³ of heptane wassubsequently introduced into the reactor. Immediately afterwards, 25 mgof Atmer 163 were introduced. The polymerization was stopped after 10minutes by venting and the polymer obtained was dried under reducedpressure. This gave 5 g of polypropylene copolymer. M_(w): 307 000g/mol; M_(w)/M_(n): 3.2. ¹³C-NMR spectrum: signal intensities: C¹:74.171; C⁵ and C¹²: 14.780; C⁷: 6.203; C⁹ and C¹⁰: 1.931; C⁶ and C¹³:2.289; C¹⁵ and C¹⁶: 0.625. This gives an ethylene content of 10.0%.Proportion soluble in diethyl ether: 0.54%. GPC-IR spectroscopy: Thespectra were combined so that one spectrum corresponds to eachchromatographic minute (120 scans/spectrum).

Proportion of Retention time Molar mass range the fraction PE content[min] [g/mol] [% by wt.] [mol %] 16 to 17 4.5e6−1.1e6 4.4 10.8 17 to 181.1e6−4.2e5 13.3 9.8 18 to 19 4.2e5−2e5   21.6 10.0 19 to 20   2e5−1.1e523.0 11.0 20 to 21 1.1e5−6.5e4 17.6 11.1 21 to 22 6.5e4−3.8e4 11.6 11.022 to 23 3.8e4−2.2e4 5.8 12.0

The differences between the individual fractions are within measurementaccuracy (±1%) and purely random. Division into narrower fractions givesan analogous result.

Experiment 107

A dry 16 dm³ reactor which had been flushed firstly with nitrogen andsubsequently with ethylene was charged with ethylene until a pressureincrease of 500 Pa had been established at 30° C. 10 l of liquid propeneand 8 cm³ of 20% strength by weight triethylaluminum solution in Varsol(Witco) as scavenger were subsequently added, the mixture was stirredfor 15 minutes and subsequently heated to 65° C. A suspension of 1.1 gof the catalyst Al in heptan was subsequently introduced into thereactor. Immediately afterwards, 110 mg of Atmer 163 were introduced.The polymerization was stopped after 10 minutes by venting and the ofpolymer obtained was dried under reduced pressure. This gave 22 g ofpolypropylene copolymer. M_(w): 362 000 g/mol; M_(w)/M_(n): 3.1. ¹³C-NMRspectrum: signal intensities: C¹: 91.243; C⁵ and C¹²: 4.741; C⁷: 2.222;C⁹ and C¹⁰: 0.686; C⁶ and C¹³: 0.574; C¹⁵ and C¹⁶: 0.534. This gives anethylene content of 3.2%.

Comparative Experiment 108

The polymerization of Experiment 106 was repeated using 250 mg of thecomparative catalyst B. This gave 31 g of polypropylene copolymer M_(w):273 000 g/mol; M_(w)/M_(n): 3.2. ¹³C-NMR spectrum: signal intensities:C¹: 76.419; C⁵ and C¹²: 13.199; C⁷: 5.600; C⁹ and C¹⁰: 1.531; C⁶ andC¹³: 2.220; C¹⁵ and C¹⁶: 1.032. This gives an content of 9.0%.

Comparative Experiment 109

The polymerization of Experiment 106 was repeated using 11.7 cm³ of 20%strength by weight triisobutylaluminum solution in Varsol (Witco) asscavenger and 190 mg of the comparative catalyst C. This gave 7 g ofpolypropylene copolymer. M_(w): 95 700 g/mol; M_(w)/M_(n): 2.6. ¹³C-NMRspectrum: signal intensities: C¹: 74.745; C⁵ and C¹²: 14.393; C⁷: 6.009;C⁹ and C¹⁰: 1.764; C⁶ and C¹³: 2.591; C¹⁵ and C¹⁶: 0.498. This gives anethylene content of 9.8%.

1. A metallocene of the formula (I)

where M¹¹ is a metal of group IVb of the Periodic Table of the Elements,R³¹, R³² are identical or different and are each a hydrogen atom, aC₁-C₁₀-alkyl group, a C₁-C₁₀-alkoxy group, a C₆-C₂₀-aryl group, aC₆-C₂₀-aryloxy group, a C₂-C₁₀-alkenyl group, an OH group, anN(R^(32a))₂ group, where R^(32a) is a C₁-C₁₀-alkyl group or aC₆-C₁₄-aryl group, or a halogen atom, where R³¹ and R³² can also bejoined to form a ring, R³⁴, R³⁶, R³⁷ and R³⁸ and also R^(34′), R^(36′),R^(37′) and R^(38′) are identical or different and are each a hydrogenatom or a hydrocarbon group which may be halogenated, linear, cyclic orbranched, R³³ is a hydrocarbon group which is unbranched in the αposition and may be halogenated, R³³ is a hydrocarbon group which iscyclized in the α position or branched in the α position and may behalogenated, R³⁵, R^(35′) are identical or different and are each aC₆-C₂₀-aryl group which in the para position relative to the point oflinkage to the indenyl ring bears a substituent R⁴³ or R^(43′), or

R³⁹ is a bridge

where R⁴⁰, R⁴¹ can be identical or different, even when they have thesame index, and are each a hydrogen atom, a halogen atom or a C₁-C₄₀group, where R⁴⁰ and R⁴¹ may each, together with the atoms connectingthem, form one or more rings, x is an integer from zero to 18, M¹² issilicon, germanium or tin, and R³⁹ may also link two units of theformula I with one another, R⁴³ is a C₁-C₂₀-alkyl radical, aC₂-C₁₀-alkenyl radical, a C₆-C₁₈-aryl radical, a C₇-C₂₀-arylalkylradical, a C₇-C₂₀-alkylaryl radical, a C₈-C₂₀-arylalkenyl radical, wherethe hydrocarbon radicals may also be halogenated or partiallyhalogenated by fluorine or chlorine, —N(R⁴⁴)₂, —P(R⁴⁴)₂, —SR⁴⁴,Si(R⁴⁴)₃, —[N(R⁴⁴)₃]⁺ or —[P(R⁴⁴)₃]⁺, where the radicals R⁴⁴ areidentical or different and are each a hydrogen atom or a hydrocarbongroup which may be halogenated, linear, cyclic or branched, R⁴³ ishydrogen or is as defined for R⁴³, R⁴⁵, R^(45′), R⁴⁶ and R^(46′) areeach C₄-C₂₀-aryl, alkenyl or alkyl ring systems which may also be linkedto the radicals R³⁶, R^(36′) or R³⁴, R^(34′).
 2. A metallocene asclaimed in claim 1, wherein M¹¹ is zirconium or hafnium, R³¹ and R³² areidentical or different and are each a C₁-C₁₀-alkyl group, aC₁-C₁₀-alkoxy group, a C₆-C₁₀-aryloxy group or a halogen atom, where R³¹and R³² may also be joined to form a ring, R³³ is a linear C₁-C₁₀-alkylgroup or a linear C₂-C₁₀-alkenyl group, R^(33′) is a hydrocarbon groupwhich is cyclized in the α position or branched in the α position and inwhich the atom in the α position is bound to a total of three carbonatoms, R³⁴, R³⁶, R³⁷ and R³⁸ and also R^(34′), R^(36′), R^(37′) andR^(38′) are identical or different and are each a hydrogen atom or aC₁-C₁₀-alkyl group which may be halogenated, linear, cyclic or branched,R³⁹ is R⁴⁰R⁴¹Si═, R⁴⁰R⁴¹Ge═, R⁴⁰R⁴¹C═ or —(R⁴⁰R⁴¹C—CR⁴⁰R⁴¹)—, where R⁴⁰and R⁴¹ are identical or different and are each hydrogen or aC₁-C₂₀-hydrocarbon group, R⁴³ is a C₁-C₁₀-alkyl radical, aC₂-C₁₀-alkenyl radical, a C₆-C₁₈-aryl radical, a C₇-C₂₀-arylalkylradical, a C₇-C₂₀-alkylaryl radical, a C₈-C₂₀-arylalkenyl radical, wherethe hydrocarbon radicals may also be halogenated or partiallyhalogenated by fluorine or chlorine, —N(R⁴⁴)₂, —P(R⁴⁴)₂, —SR⁴⁴,—Si(R⁴⁴)₃, —[N(R⁴⁴)₃]⁺ or —[P(R⁴⁴)₃]⁺, where the radicals R⁴⁴ areidentical or different and are each a hydrogen atom or a hydrocarbongroup which may be halogenated, linear, cyclic or branched, R^(43′) isas defined for R⁴³ or is hydrogen and R⁴⁵, R^(45′), R⁴⁶ and R^(46′) area C₄-C₈-aryl ring system.
 3. A metallocene as claimed in claim 1,wherein M¹¹ is zirconium, R³¹, R³² are identical and are each chlorine,methyl or phenoxide, R³³ is methyl, ethyl, n-propyl or n-butyl, R³³ is ahydrocarbon group which is cyclized in the α position or branched in theα position and in which the atom in the α position is bound to a totalof three carbon atoms, R³⁹ is R⁴⁰R⁴¹Si═, R⁴⁰R⁴¹C═ or—(R⁴⁰R⁴¹C—CR⁴⁰R⁴¹)—, where R⁴⁰ and R⁴¹ are identical or different andare each phenyl or methyl, R³⁴, R³⁶, R³⁷ and R³⁸ and also R^(34′),R^(36′), R^(37′) and R^(38′) are each hydrogen, R³⁵, R^(35′) areidentical or different and are each a C₆-C₂₀-aryl group which bears asubstituent R⁴³ or R^(43′) in the para position relative to the point oflinkage to the indenyl ring, where R⁴³ or R^(43′) is a branchedC₃-C₁₀-alkyl radical, a branched C₃-C₁₀-alkenyl radical, a branchedC₇-C₂₀-alkylaryl radical or an Si(R⁴⁴)₃ radical where R⁴⁴ is as definedfor R³³, where the hydrocarbon radicals may also be halogenated orpartially halogenated by fluorine or chlorine.
 4. A metallocene asclaimed in claim 1, wherein M¹¹R³¹R³² is ZrCl₂, Zr(CH₃)₂, Zr(O—C₆H₅)₂,is methyl, ethyl, n-propyl, n-butyl, R³³ is isopropyl, sec-butyl,cyclobutyl, 1-methylbutyl, 1-ethylbutyl, 1-methylpentyl, cyclopentyl,cyclohexyl, cyclopent-2-enyl, cyclopent-3-enyl, cyclohex-2-enyl,cyclohex-3-enyl, para-methylcy-clohexyl, R³⁴, R³⁶, R³⁷ and R³⁸ and alsoR^(34′), R^(36′), R^(37′) and R^(38′) are hydrogen, R³⁵, R^(35′) areeach p-isopropylphenyl, p-tert-butylphenyl, p-s-butylphenyl,p-cyclohexylphenyl, p-trimethylsilylphenyl, p-adamantylphenyl,p-tris(triflouromethyl)methylphenyl, R³⁹ is dimethylsilanediyl,dimethylgermanediyl, ethylidene, 1-methylethylidene,1,1-dimethylethylidene, 1,2-dimethylethylidene,1,1,2,2-tetramethylethylidene, dimethylmethylidene,phenylmethyl-methylidene, diphenylmethylidene.
 5. A metallocene compoundselected from the group consisting ofdimethylsilanediyl(2-ethyl-4-(4′-tert-butylphenyl)indenyl)-(2-isopropyl-4-(4′-tert-butylphenyl)indenyl)zirconiumdichloride,dimethylsilanediyl(2-methyl-4-(4′-tert-butylphenyl)indenyl)-(2-isopropyl-4-(1-naphthyl)indenyl)zirconiumdichloride,dimethylsilanediyl(2-methyl-4-phenyl)-1-indenyl)-(2-isopropyl-4-(4′-tert-butylphenyl)-1-indenyl)zirconiumdichloride,dimethylsilanediyl(2-isopropyl-4-(4′-tert-butylphenyl)-indenyl)(2-methyl-4,5-benzindenyl)zirconiumdichloride,dimethylsilanediyl(2-methyl-4-(4′-tert-butylphenyl)-indenyl)(2-isopropyl-4-(4′-tert-butylphenyl)indenyl)zirconiumdichloride,dimethylsilanediyl(2methyl-4-(4′-tert-butylphenyl)indenyl)-(2-isopropyl-4-phenylindenyl)zirconiumdichloride,dimethylsilanediyl(2-ethyl-4-(4′-tert-butylphenyl)indenyl)-(2-isopropyl-4-phenyl)indenyl)zirconiumdichloride,dimethylsilanediyl(2-isopropyl-4-(4′-tert-butylphenyl)-indenyl)-(2-methyl-4-(1-naphthyl)indenyl)zirconiumdichloride or a mixture thereof.
 6. A process for the polymerization ofolefins, wherein the polymerization is carried out in the presence of acatalyst system comprising at least one cocatalyst and at least onemetallocene as claimed in claim
 1. 7. A compound of the formula (II)

where M is Ti, Zr or Hf, R³ is a hydrogen atom or a C₁-C₂₀ group, R⁵ isdifferent from R³ and is sec-butyl, isopropyl, 1-methylbutyl,1-methylpentyl, cyclopentyl or cyclohexyl, R⁴, R⁶, R⁵⁰ are identical ordifferent and are each a hydrogen atom or a C₁-C₂₀ group, R²⁰, R²¹ areidentical or different and are each a substituted C₆-C₁₈-aryl group,C₅-C₁₈-heteroaryl, C₇-C₂₀-arylalkyl, C₇-C₂₀-alkylaryl, fluorinatedC₆-C₁₈-aryl, fluorinated C₇-C₂₀-arylalkyl or fluorinatedC₇-C₂₀-alkylaryl and two radicals R²⁰ may form a monocyclic orpolycyclic ring system which may in turn be substituted, X is a halogenatom, an alkyl group, or a substituted or unsubstituted phenoxide, Q isa C₄-C₂₄-aryl ring system which may in turn bear R²⁰ groups assubstituents, or a heteroaryl which together with the cyclopentadienylring forms an azapentalene, thiapentalene or phosphapentalene which mayin turn be substituted by R²⁰, z is 0, 1, 2 or 3, l is an integer fromzero to 4, and B is a bridging structural element between the twoindenyl radicals.
 8. A compound as claimed in claim 7, wherein M iszirconium, R³ is a hydrogen atom or a C₁-C₁₂-alkyl group, R⁵ issecbutyl, isopropyl, 1-methylbutyl, cyclopentyl, cyclohexyl, R⁴, R⁶ arehydrogen atoms, R²⁰, R²¹ are identical or different and substitute theindenyl ring in the 4 position, X is chlorine or methyl, and Q is aC₄-aryl system which together with the cyclopentadienyl ring forms anindenyl system which may in turn be substituted by R²⁰.
 9. A compound ofthe formula (II′)

M is Ti, Zr or Hf, R³ is a hydrogen atom or a C₁-C₂₀ group, R⁵ isdifferent from R³ and is sec-butyl, isopropyl, 1-methylbutyl,1-methylpentyl, cyclopentyl or cyclohexyl, R⁴, R⁶, R⁵⁰ are identical ordifferent and are each a hydrogen atom or a C₁-C₂₀ group, R²⁰ areidentical or different and are each a C₆-C₁₈-aryl group which may besubstituted, C₅-C₁₈-heteroaryl, C₇-C₂₀-arylalkyl, C₇-C₂₀-alkylaryl,fluorinated C₆-C₁₈-aryl, fluorinated C₇-C₂₀-arylalkyl or fluorinatedC₇-C₂₀-alkylaryl and two radicals R²⁰ may form a monocyclic orpolycyclic ring system which may in turn be substituted, R²¹ is asubstituted C₆-C₁₈-aryl , C₅-C₁₈-heteroaryl, C₇-C₂₀-arylalkyl,C₇-C₂₀-alkylaryl, fluorinated C₆-C₁₈-aryl, fluorinated C₇-C₂₀-arylalkylor fluorinated C₇-C₂₀-alkylaryl, X is a halogen atom, an alkyl group, ora substituted or unsubstituted phenoxide, Q is a heteroaryl whichtogether with the cyclopentadienyl ring forms an azapentalene,thiopentalene or phosphorpentalene which may in turn be substituted byR²⁰, z is an integer 0, 1, 2 or 3, l is an integer from 0 to 4, and B isa bridging structural element between the two indenyl radicals.
 10. Acompound as claimed in claim 7, wherein B is the group M³R¹³R¹⁴ where M³is silicon and R¹³ and R¹⁴ are identical or different and are each aC₁-C₂₀-hydrocarbon-containing group.
 11. A compound as claimed in claim7, wherein B is an Si(Me)₂, Si(Ph)₂, Si(MeEt), Si(PhMe), Si(PhEt) orSi(Et)₂ group, where Ph is substituted or unsubstituted phenyl and Et isethyl.
 12. A compound as claimed in claim 9, wherein the formula (II′)representsdimethylsilanediyl(2-methylthiapentalenyl)-(2-isopropyl-4-(4′-tert-butylphenyl)indenyl)zirconiumdichloride.
 13. A catalyst system comprising one or more compounds asclaimed in claim 1 and also one or more cocatalysts and/or one or moresupports.
 14. A process for preparing a polyolefin by polymerization ofone or more olefins in the presence of one or more compounds as claimedin claim
 7. 15. A process for the preparation of block or impactcopolymers of propylene which comprises in a first stage polymerizingpropylene or random copolymerizing propylene with from 0.001 to 15% byweight of at least one further 1-alkene having up to 8 carbon atoms, andin a second stage copolymerizing propylene with ethylene wherein thepropylene-ethylene copolymer has an ethylene content of from 15 to 80%by weight and may further comprise additional C₄-C₈-alk-1-enes, whereinboth polymerization stages are carried out in the presence of a catalystsystem comprising at least one cocatalyst and at least one compound ofthe formula (II″),

where M is Ti, Zr or Hf, R³ is a hydrogen atom or a C₁-C₂₀ group, R⁵ isdifferent from R³ and is sec-butyl, isopropyl, 1-methyl-butyl,1-methylpentyl, cyclopentyl or cyclohexyl, R⁴, R⁶, R⁵⁰ are identical ordifferent and are each a hydrogen atom or a C₁-C₂₀ group, are identicalor different and are each a C₆-C₁₈-aryl group which may be substituted,C₅-C₁₈-heteroaryl, C₇-C₂₀-arylalkyl, C₇-C₂₀-alkylaryl, fluorinatedC₆-C₁₈-aryl, fluorinated C₇-C₂₀-arylalkyl or fluorinatedC₇-C₂₀-alkylaryl and two radicals R²⁰ may form a monocyclic orpolycyclic ring system which may in turn be substituted, R²¹ is asubstituted C₆-C₁₈-aryl group, C₅-C₁₈-heteroaryl, C₇-C₂₀-arylalkyl,C₇-C₂₀-alkylaryl, fluorinated C₆-C₁₈-aryl, fluorinated C₇-C₂₀-arylalkylor fluorinated C₇-C₂₀-alkylaryl, X is a halogen atom, an alkyl group, ora substituted or unsubstituted phenoxide, Q is a C₄-C₂₄-aryl ring systemwhich may in turn bear R²⁰ groups as substituents, or a heteroaryl whichtogether with the cyclopentadienyl ring forms an azapentalene,thiopentalene or phosphorpentalene which may in turn be substituted byR²⁰, z is an integer 0, 1, 2 or 3, l is an integer from 0 to 4, and B isa bridging structural element between the two indenyl radicals.
 16. Aprocess for the polymerization of olefins, wherein the polymerization iscarried out in the presence of a catalyst system comprising at least onecocatalyst and at least one metallocene as claimed in claim
 5. 17. Acatalyst system comprising one or more compounds as claimed in claim 5and also one or more cocatalysts and/or one or more supports.
 18. Acatalyst system comprising one or more compounds as claimed in claim 7and also one or more cocatalysts and/or one or more supports.
 19. Acatalyst system comprising one or more compounds as claimed in claim 9and also one or more cocatalysts and/or one or more supports.
 20. Theprocess of claim 15, wherein the at least one compound of the formula(II″) of the catalyst system meets at least one of the followingprovisions: M is zirconium, R³ is hydrogen, C₁-C₁₈-alkyl,C₂-C₁₀-alkenyl, C₃-C₁₅-alkylalkenyl, C₆-C₁₈-aryl, C₅-C₁₈-heteroaryl,C₇-C₂₀-arylalkyl, C₇-C₂₀-alkylaryl, fluorinated C₁-C₁₂-alkyl,fluorinated C₆-C₁₈-aryl, fluorinated C₇-C₂₀-arylalkyl or fluorinatedC₇-C₂₀-alkylaryl, R⁴, R⁶, R⁵⁰ are identical or different and are eachhydrogen, C₁-C₁₈-alkyl, C₂-C₁₀-alkenyl, C₃-C₁₅-alkylalkenyl,C₆-C₁₈-aryl, C₅-C₁₈-heteroaryl, C₇-C₂₀-arylalkyl, C₇-C₂₀-alkylaryl,fluorinated C₁-C₁₂-alkyl, fluorinated C₆-C₁₈-aryl, fluorinatedC₇-C₂₀-arylalkyl or fluorinated C₇-C₂₀-alkylaryl, R²⁰ are identical ordifferent and are each phenyl, tolyl, xylyl, tert-butylphenyl,3,5-dimethylphenyl, 3,5-di-tert-butyl-phenyl, 4-ethylphenyl,4-trimethylsilylphenyl, methoxyphenyl, naphthyl, acenaphthyl,phenanthrenyl or anthracenyl, C₅-C₁₈-heteroaryl, C₇-C₂₀-arylalkyl,C₇-C₂₀-alkylaryl, fluorinated C₆-C₁₈-aryl, fluorinated C₇-C₂₀-arylalkylor fluorinated C₇-C₂₀-alkylaryl and two radicals R²⁰ may form amonocyclic or polycyclic ring system which may in turn be substituted,R²¹ is tolyl, xylyl, tert-butylphenyl, 3,5-dimethylphenyl,3,5-di-tert-butyl-phenyl, 4-ethylphenyl, 4-trimethylsilylphenyl,methoxyphenyl, C₅-C₁₈-heteroaryl, C₇-C₂₀-arylalkyl, C₇-C₂₀-alkylaryl,fluorinated C₆-C₁₈-aryl, fluorinated C₇-C₂₀-arylalkyl or fluorinatedC₇-C₂₀-alkylaryl, X is chlorine, methyl, or a substituted orunsubstituted phenoxide, and l is 1 or
 2. 21. The process of claim 20,wherein the at least one compound of the formula (II″) of the catalystsystem meets at least one of the following provisions: R³ is hydrogen,methyl, ethyl, n-butyl, n-hexyl, cyclohexyl, octyl, C₂-C₁₀-alkenyl,C₃-C₁₅-alkylalkenyl, C₆-C₁₈-aryl, C₅-C₁₈-heteroaryl, C₇-C₂₀-arylalkyl,C₇-C₂₀-alkylaryl, fluorinated C₁-C₁₂-alkyl, fluorinated C₆-C₁₈-aryl,fluorinated C₇-C₂₀-arylalkyl or fluorinated C₇-C₂₀-alkylaryl, and lis
 1. 22. A compound as claimed in claim 8, wherein B is a bridgingelement Si(Me)₂, Si(Ph)₂, Si(Et)₂, or Si(MePh).